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【单选题】

Unless ___ to speak,you should remain silent at the conference.

A.
invited
B.
inviting
C.
being invited
D.
having invited
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参考答案:
参考解析:
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举一反三

【单选题】The sentence wants ____ once more.

A.
explaining
B.
to explain
C.
being explained
D.
explained