【題目】Paul (fall) down while he (learn) to ride the bike yesterday.

【答案】fell;was learning
【解析】句意:保羅昨天在騎自行車(chē)的時(shí)候摔倒了。while引導(dǎo)的時(shí)間狀語(yǔ)從句中通常用進(jìn)行時(shí)態(tài),根據(jù)yesterday可知是過(guò)去進(jìn)行時(shí),所以第二空用was learning;第一空中的fall是短暫性動(dòng)詞,不表動(dòng)作的持續(xù),所以用一般過(guò)去時(shí),所以答案是fell;was learning。

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