23.when theirmother came,the two children pretended ______ very hard,though they didnothing.A)work at theirlessonsB)to work at theirlessonsC)working in theirlessonsD)to work in theirlessons

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23.when theirmother came,the two children pretended ______ very hard,though they didnothing.A)work at theirlessonsB)to work at theirlessonsC)working in theirlessonsD)to work in theirlessons

23.when theirmother came,the two children pretended ______ very hard,though they didnothing.A)work at theirlessonsB)to work at theirlessonsC)working in theirlessonsD)to work in theirlessons
23.when theirmother came,the two children pretended ______ very hard,though they didnothing.
A)work at theirlessons
B)to work at theirlessons
C)working in theirlessons
D)to work in theirlessons

23.when theirmother came,the two children pretended ______ very hard,though they didnothing.A)work at theirlessonsB)to work at theirlessonsC)working in theirlessonsD)to work in theirlessons
固定用法,pretend后面必然要加to,
pretend to do
to be doing
to have done
work in,后接工作地点
work at,后接工作内容
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