单项选择题

Teachers can hardly be ______ careful when they instruct a lesson.

A. very
B. enough
C. too
D. so
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单项选择题
______ be the first to employ nuclear weapons.
A. Never China will

B. China never will
C. At no time will China
D. At any rate will China not
单项选择题
Rarely we have seen such an effective actor as he has proven himself to be.
A. Rarely
B. we have seen
C. as he
D. to be
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