单项选择题

Greater efforts to increase agricultural production must be made if food shortage ______avoided.

A. be

B. will be
C. to be

D. is to be
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单项选择题
The second book was ______ by August 1952, but two years later, the end was still nowhere in sight.
A. completed


B. to complete
C. to have completed

D. to have been completed
单项选择题
If an earthquake occurred, home of the one-storey houses ______.
A. might be left stand

B. might leave to be standing
C. might be left to stand

D. might be left standing
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