单项选择题
______ he will come or not is unknown.
A．If
B．Whether
C．That
D．What
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单项选择题
Sorry, I don' t know he is a friend of______.
A．your brother
B．your brothers
C．your brother' s friend
D．your brother' s
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单项选择题
No sooner______ than he realized that he should have remained silent.
A．the words had spoken
B．had the words spoken
C．the words had been spoken
D．had the words been spoken
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