【題目】Mum (mop) the floor when I got home yesterday.

【答案】was mopping
【解析】got home是短暫性動(dòng)詞,mop是延續(xù)性動(dòng)詞,when“當(dāng)……的時(shí)候”,當(dāng)一個(gè)延續(xù)性動(dòng)作正在進(jìn)行的時(shí)候,另一個(gè)短暫性動(dòng)作發(fā)生了,延續(xù)性動(dòng)作用進(jìn)行時(shí)態(tài),故填 was mopping。句意是:昨天當(dāng)我到家的時(shí)候我媽媽正在拖地。

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