【題目】After he heard his son’s voice, he began to smile. (保持句意不變)

He ________ begin to smile ________ he heard his son’s voice.

【答案】didn’t until

【解析】

句意：聽(tīng)到兒子的聲音，他開(kāi)始笑了。

根據(jù)句意理解可知，這里還可以表達(dá)為“他沒(méi)有開(kāi)始笑，直到聽(tīng)到兒子的聲音”，英語(yǔ)中表達(dá)“直到……才”的結(jié)構(gòu)是not … until，是until引導(dǎo)的時(shí)間狀語(yǔ)從句，而原句中動(dòng)詞用的是過(guò)去時(shí)，所以這里改寫(xiě)的句子也要用過(guò)去時(shí)，變成否定要借助助動(dòng)詞did，與not縮寫(xiě)成didn’t，故答案為didn’t，until。

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