单项选择题

They will fail, because I think they ________ a eneral understanding of the situation.

A．are lacking
B．lack
C．lack of
D．have lacked
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单项选择题
I would have come sooner, but I ________ that you were waiting.
A．did know
B．had known
C．don’t know
D．didn’t know
单项选择题
He ________ on the essay for an hour but so far has written only a hundred words.
A．worked
B．has been working
C．works
D．is working
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