【題目】Several weeks had gone by ________ I realized the painting was missing.

A.asB.sinceC.whenD.before

【答案】D

【解析】

考查連詞。句意:幾個星期過去了,我才意識到那幅畫不見了。A. as隨著……;B. since自從……;C. when當……時候;D. before在……之前。此處表示在意識到之前已經(jīng)過去了幾個星期,要用before。故選D。

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