问题

— The window must have taken you quite a lot of time that day.— You are right. They _____ for weeks. [ ]

A: haven't been cleaned
B: hadn't been cleaned
C: didn't' clean
D: haven't cleaned

正确答案是：

同类题型

What ________ you ________ for this winter holiday I’m not sure, Maybe I’ll just stay at home. I’ll have a big text after the holiday.

If you ______ my advice, you ______ yourfailure now. You ________ your victory.

We no longer keep up the close friendship of few years ago, though we still visit each other_____.

What a table!I’ve never seen such a thing before. It is _________it is long.[ ]

Without electricity human life＿＿＿＿＿＿＿quite different today.