单项选择题

The woman in the office ______ not to have made too much noise.

A. ought
B. need
C. must
D. dare
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单项选择题
As it was almost time for the flight, all the passengers got ______ the plane.
A. around
B. abroad
C. aboard
D. ahead
单项选择题
Have you ever asked him the reason ______ may explain his absence from the class
A. why
B. when
C. that
D. what
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