单项选择题

It is desirable that the airplane______as light and fast as possible.

A. be made
B. is made
C. were made
D. has been made
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单项选择题
If there is the need to compete in a crowd, to battle ______ the edge the surest strategy is to develop the unexpected.
A. on
B. for
C. against
D. with
单项选择题
He couldn’t ______ his curiosity to see what was in the box.
A. retain
B. restrain
C. restrict
D. represent
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