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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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
单项选择题
The boy was made ______ the song once again.
A．sing
B．to sing
C．be singing
D．being sing
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