【題目】It is important to wash hands ______ we have meals.

A. beforeB. afterC. whenD. but

【答案】A

【解析】

句意:在我們吃飯之前洗手是很重要的。

before之前;after之后;when時候;but但是。根據(jù)常識可知,飯前應該洗手,故應選A,引導時間狀語從句。

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