----- The windows must have taken you quite a long time that day. ----- Right. They ______ for monthsA.haven’t been cleanedB.didn’t cleanC.hadn’t been cleanedD.haven’t cleaned
网友回答
C解析考查时态。根据must have taken可知是过去的某个时间擦窗户的，那么窗户很久没有被擦是在这之前，所以使用过去完成时。句意：—那些窗户一定花了你很长时间吧！—是的。他们已经好几个月没有被擦了。