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
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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
单项选择题
You can find ________ in the book on baby care.
A．many advice
B．some advices
C．a lot of advices
D．lots of advice
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