【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(dāng)我正做作業(yè)時(shí),電話鈴聲響了。when可指時(shí)間點(diǎn)和時(shí)間段;while只能指時(shí)間段,從句中用延續(xù)性動詞;as多用于表示兩個(gè)動作同時(shí)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(dǎo)條件狀語從句。這里考查句型be doing sth. when…“正在做某事,這時(shí)…”,故選A。

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