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We ______ for quite a long time.a、were keeping waitedb、were kept waitedc、were keeping waitingd、were kept waiting

题目详情
We ______ for quite a long time.
a、were keeping waited
b、were kept waited
c、were keeping waiting
d、were kept waiting
▼优质解答
答案和解析
D 被要求等 keep doing sth