单项选择题

Acute hearing helps most animals sense the approach of thunderstorms long before people __________.

A. do
B. hear
C. do them
D. hearing it

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单项选择题
The reporters exposed the corruption of several senior officers in the government; consequently, these officers _________ to resign from office.
A. have asked
B. were asked
C. had asked
D. had been asked
单项选择题
He never hesitates to make _____ criticisms _____ are considered helpful to others.
A. so that
B. so as
C. such that
D. such as
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