-Tom,you look tired-Hi,Tom,you look tired-yes,i'm too tired.i ( ) a report all night long.A am preparingB preparedC have been preparedD had prepared答案C为什么用现在完成时?

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-Tom,you look tired-Hi,Tom,you look tired-yes,i'm too tired.i ( ) a report all night long.A am preparingB preparedC have been preparedD had prepared答案C为什么用现在完成时?

-Tom,you look tired-Hi,Tom,you look tired-yes,i'm too tired.i ( ) a report all night long.A am preparingB preparedC have been preparedD had prepared答案C为什么用现在完成时?
-Tom,you look tired
-Hi,Tom,you look tired
-yes,i'm too tired.i ( ) a report all night long.
A am preparing
B prepared
C have been prepared
D had prepared
答案C为什么用现在完成时?

-Tom,you look tired-Hi,Tom,you look tired-yes,i'm too tired.i ( ) a report all night long.A am preparingB preparedC have been preparedD had prepared答案C为什么用现在完成时?
题目中tom回答：我准备了整夜的report,强调的是过去发生的并且是持续发生的.所以才很累.这是从对话逻辑可以得出的答案.准备report的事情发生在过去,并且已经完成.并且现在完成时可以表示时间段的持续动作.
a,将要准备（be doing）
b,做过（时间点,题目是强调持续整夜的准备）
d,过去完成时（简单理解为过去的过去,也可表示持续动作,题目中用的是i am,说明是现在的过去）

强调准备了整个晚上而带来tired的结果

其实按常理选A或B也说得通，但若偏要只选一个还是选C较好。C项用现在完成时，表示的是动词的延续，表达出Tom一直在干活，并且此时还在干，更能体现Tom很累；A项只表示Tom此时在干；B项只表示过去在干；D项是错的，搭配不当

他现在看起来很累，但是准备报告是发生在过去，并且已经完成，所以用现在完成时。现在完成时就是指发生在过去但是现在已经完成的动作

这样理解吧, 由于后面跟了个表示一段时间的词组 all night long, 所以应该填一个持续性的动作, 即be preparing, 即一直在准备, 这样就只有A和C两个了, A的时态不对, 所以选C. 如果有个答案是Had been prepared, 也对.

-Tom,you look tired-Hi,Tom,you look tired-yes,i'm too tired.i ( ) a report all night long.A am preparingB preparedC have been preparedD had prepared答案C为什么用现在完成时? You look at tired today You look at tired today --Hi,Tom,you look tired.--I am tired.I_the living room all day.A.painted B.had painted C.have painted D.have been painting You look tired today 什么意思 You look tired today是什么句型 You look tired now是什么时态? hi,tom.you look tired.what's the matter?i ----------- well last night.a didn't sleep b don't sleepc haven't slept d won't sleep -Tom,you look so tired.-Yes,I did my homework___12o'clock last night .A.before B.at C.after D.until -Hi,Tom,You look tired.-Yes,I__the room all the afternoon.A.paintedB.had paintedC.have paintedD.have been painting为什么选择D You look tired; you'd better ________ (have) a rest. YOU look very tired.You should stop______(rest). Do you look the ___ as Tom? Tom,you look unhappy today.What____ (发生)? you look tired now you looks tired now 哪个对?为什么? You look tired.Why not stop having a rest? 改错 -You look so tired today.-so I___A am B do 翻译you look tired what's the matter ?