18.The twinswere quarrelling (quarrel) at this time yesterday.Nobody knew when they stopped.

分析 昨天這個(gè)時(shí)候這對(duì)雙胞胎在吵架.沒(méi)有人直到他們什么時(shí)候停止的.

解答 答案:were quarrelling.
根據(jù)The twins--(quarrel) at this time yesterday.Nobody knew when they stopped,可知昨天這個(gè)時(shí)候這對(duì)雙胞胎在吵架.沒(méi)有人直到他們什么時(shí)候停止的,這里at this time yesterday表示昨天這個(gè)時(shí)候,一般用于過(guò)去進(jìn)行時(shí),由were/was+動(dòng)詞的ing構(gòu)成,這里主語(yǔ)是twins,是復(fù)數(shù),所以應(yīng)該是were quarrelling.故填were quarrelling.

點(diǎn)評(píng) 本題考查用所給單詞的適當(dāng)形式填空,首先要根據(jù)語(yǔ)境明確句意,然后再根據(jù)相關(guān)語(yǔ)法對(duì)所給單詞在形式上做出正確的變化.

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