He couldn't start his car.He really didn't know______.A.what can he do B what he can do Cwhat to do D how to do 选项和原因

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He couldn't start his car.He really didn't know______.A.what can he do B what he can do Cwhat to do D how to do 选项和原因

He couldn't start his car.He really didn't know______.A.what can he do B what he can do Cwhat to do D how to do 选项和原因
He couldn't start his car.He really didn't know______.
A.what can he do B what he can do Cwhat to do D how to do
选项和原因

He couldn't start his car.He really didn't know______.A.what can he do B what he can do Cwhat to do D how to do 选项和原因
C对.A:宾语从句应用陈述语气.B:宾语从句应和主句时态一致,应该为what he could do.D:应该为how to do it.

C
宾语从句为陈述句,排除A。
排除B,时态为过去时。
排除D,how to do sth,不定式少宾语。

应当选D
他不能启动他的车,他实在不知道该怎么办;