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【单选题】

When asked why he went there,he said he was sent there___for a space flight.

A.
training
B.
being trained
C.
to have trained
D.
to be trained
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参考答案:
参考解析:
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举一反三

【单选题】Stay awake!You should know that it ________to sleep in class. [ ]

A.
doesn't permit
B.
is not permitted
C.
will not be permitted
D.
was not permitted