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英语句子改错:I didn't know why you were so busy in the last there years.改ABCD中其一:A.why B.were C.so busy D.in the last three years

题目详情
英语句子改错:I didn't know why you were so busy in the last there years.
改ABCD中其一:A.why B.were C.so busy D.in the last three years
▼优质解答
答案和解析
B.改成had been.in the last three years在句子末尾表示在过去三天里,表示一个时间段里发生的事情,故要用延续性的语态来表示.一般过去时只是短暂性的语态.
一般的,in the last+时间,句子用一般现在时态,但此处是I didn't know,主句是过去时,相应的have改成had