【題目】That Sunday, we were packing to leave for a week away _____ my son heard cries for help.

A. when B. while

C. as D. because

【答案】A

【解析】

考查固定句式。be doing sth....when...,正在做某事的時候，這時突然---。句意：那個星期天，我們正打包離開去度周末，我兒子突然聽到呼救聲。故選A。

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