【題目】進(jìn)門前先敲門是禮貌的。
It's polite to the door before you come in.

【答案】knock;at
【解析】knock at the door敲門,to后跟動(dòng)詞原形,It是形式主語,后跟動(dòng)詞不定式做真正的主語,所以答案是knock; at 。

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