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Too much sugar ________ bad for our teet...

Too much sugar ________ bad for our teeth.

A.be B.am C.is D.are

 

C 【解析】 句意:过多的糖对我们的牙齿有害。 考查be动词用法,A. be原形;B. am主语为第一人称单数;C. is主语为单数或不可数名词;D. are主语为复数,主语为“sugar 不可数名词”,谓语应该用is,故选C。
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