单项选择题

It was necessary that he ______ everything ready ahead of time.

A. has made
B. had made
C. make
D. makes
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单项选择题
The authority claims that the new pills can dramatically increase life expectancy, but there's no evidence to support this.
A. empirical
B. actual
C. concrete
D. imperial
单项选择题
One cannot be too careful, ______
A. can one
B. can he
C. can she
D. can they
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