问题

We________on this 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

Could I your iPad, Alice—Of course. Here you are.

Marry is no different from any otherteenage girl, but she has given enough thought __________ her future career.

297. Just make a decision and ________ it.

There is a great danger if the driver has been drinking alcohol or taking drugs, or _____ by speeding or breaking down traffic laws.

______ Mr Li is now waiting for you on ______ firstfloor