1. Not until Mr. Smith came to China ________ what kind of country she is.
A. he knew
B. he didn’t know
C. did he know
D. be couldn’t know
2.All ________ is a continuous supply of fuel oil.(2015贵州)
A. that is needed
B. what is needed
C. the thing is needed
D. for their needs
3. He didn’t answer when I called—he ________ to bed.
A. would have gone
B. will have gone
C. must have gone
D. shall have gone
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