No matter how bright a talker you are, there are times when it’s better ______ silent.
A.remainB.be remainingC.to remainD.having remained
C

試題分析:無論你是多么健談的人,總有些時候保持沉默更好。此題是no matter how引導的讓步狀語從句,而主句中又含有一個when引導的定語從句,從句中it是形式主語,而真正的主語是不定式結(jié)構(gòu)to be silent。句型結(jié)構(gòu)為:It + be + 形容詞 + (of/for sb.)+ 動詞不定式。
點評:動詞不定式,動名詞或主語從句作主語時,通常用it作形式主語,放到句首,將真正的主語放在后面,常見句型有:
1. It + be + 形容詞+主語從句,如:
It is uncertain whether he can come to Jenny’s birthday party or not.
2. It + be + 名詞詞組 + 主語從句,這類名詞有:a fact, a pity, a shame, an honour,a question等,如:
It’s a pity that you missed the exciting football match.
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