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【题目】The polite boy always knocks at the door before ________ his teachers’ office.

A.checkingB.choosingC.describingD.entering

【答案】D

【解析】

句意:那个有礼貌的男孩进老师办公室前总是先敲门。

考查动词,checking检查;choosing选择;describing描述;entering进入。根据“knocks at the door”可知应该是进办公室前敲门,故选D

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