单项选择题

We must study English well, no matter ______ difficult it is.

A) what
B) however
C) how
D) that
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单项选择题
The workers ______ a new hospital since the end of last year.
A. have built
B. have been building
C. had built
D. were building
单项选择题
You'd better ______ some money for emergency , she told me.
A. set back

B. set about
C. set down

D. set aside
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