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【题目】It's a good habit ________ (cover) your mouth when you sneeze. Moreover, it shows good manners towards others.

【答案】to cover

【解析】

句意:打喷嚏时捂住嘴是个好习惯。此外,它还表现出对他人的礼貌。

考查固定句式。考查的是固定句式"It is + 名词 + to do sth.",意思是"做什么事是……",这个句型当中,It 是形式主语,真正的主语是后面的动词不定式 to cover your mouth。结合句意,"当你打喷嚏的时候,捂住自己的嘴巴是一个好习惯"。故答案为to cover

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