【題目】Too much sugar ________ bad for our teeth.

A.beB.amC.isD.are

【答案】C

【解析】

句意:過多的糖對我們的牙齒有害。

考查be動(dòng)詞用法,A. be原形;B. am主語為第一人稱單數(shù);C. is主語為單數(shù)或不可數(shù)名詞;D. are主語為復(fù)數(shù),主語為“sugar 不可數(shù)名詞”,謂語應(yīng)該用is,故選C

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