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【題目】I was doing homework ________ the phone bell rang.

A. when B. while C. as D. if

【答案】A

【解析】

句意:當我正做作業(yè)時,電話鈴聲響了。when可指時間點和時間段;while只能指時間段,從句中用延續(xù)性動詞;as多用于表示兩個動作同時發(fā)生,或者一種狀態(tài)隨另一種狀態(tài)的變化而變化;if如果,引導條件狀語從句。這里考查句型be doing sth. when…“正在做某事,這時…”,故選A。

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