问题

We_______onthis project for four hours. Let’s have a rest.

A:are working
B:have been working
C:worked
D:had worked

正确答案是：

同类题型

_______you are familiar with the author’s ideas, try reading all the sections as quickly as you can[ ]

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Why should I correct that mistake right now, Mum It’s OK, I think..——Well, honey, it will _______ big trouble in the future.

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