【題目】She looked behind from time to time ________ she went in the dark.

A. whenB. asC. whileD. before

【答案】B

【解析】

句意:她在黑暗中走著,不時回頭看看?疾檫B詞辨析。when,while都可表示“…… 時候”;when引導(dǎo)的從句,謂語動詞既可以是延續(xù)性動詞,也可以是非延續(xù)性動詞;while引導(dǎo)的從句,謂語動詞必須是延續(xù)性動詞,而不能是非延續(xù)性動詞;as表示“在……期間”“隨著”;before“在……之前”,常與過去時,一般現(xiàn)在時等連用。根據(jù)句意語境,可知她一邊走一邊回頭看,as切合句意,故選B。

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