单项选择题

Short sight can be ______ by the use of suitable glasses.

A．fixed
B．improved
C．reduced
D．corrected
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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
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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