单项选择题

The student is shy and he ______ questions in class.

A. dares not ask
B. does not dare to ask
C. dares not to ask
D. does not dare ask
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Most environmental problems exist because adequate measures for preventing them ______ taken in the past.
A. was not
B. were not
C. were not being
D. being not
单项选择题
The policemen went into action ______ they heard the alarm.
A. promptly
B. presently
C. quickly
D. directly
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