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

試題分析:考察不定式做主語(yǔ)用法。本句中的不定式to remain silent在句中作真正的主語(yǔ),前面的it是形式主語(yǔ)。句意:無(wú)論你是一個(gè)多么聰明的談話的人,也有一些時(shí)候最好要保持沉默。不定式做主語(yǔ)的時(shí)候,表示的是一次性具體的行為,故C正確。
點(diǎn)評(píng):形式主語(yǔ),顧名思義,即形式上是主語(yǔ),但實(shí)際上不是真正的主語(yǔ),真正的主語(yǔ)是后面的動(dòng)詞不定式、動(dòng)名詞或主語(yǔ)從句等。如果讓后面的動(dòng)詞不定式、動(dòng)名詞或主語(yǔ)從句用作主語(yǔ),那么在句式上容易造成“頭重腳輕”,句式不平衡,故往往用it作形式主語(yǔ),而把真正的主語(yǔ)放在后面。it在這里沒有任何意義。
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