Every possible means _______to prevent the air pollution, but the sky is still n

题型：不详难度：来源：

Every possible means _______to prevent the air pollution, but the sky is still not clear.

A．are being used

B．have been used

C．has been used

D．had been used

答案

解析

略

举一反三

I ______ on a sofa because my grandparents have come for the weekend.

A．slept

B．was sleeping

C．have slept

D．am sleeping

题型：不详难度：| 查看答案

The child said that he had _____ the pen on the desk, but I thought he ____ to me.

A．laid; lied

B．lain; lied

C．lied; lay

D．lain; lay

题型：不详难度：| 查看答案

After he had broken the world record, Rod ____ to a restaurant to celebrate with hid friends.

A．went

B．had gone

C．would go

D．has gone

题型：不详难度：| 查看答案

— Has Tom finished his homework yet?
— I have no idea, he _____ it this morning.

A．was doing

B．did

C．had done

D．would do

题型：不详难度：| 查看答案

In the past few months, a discussion ________about whether selecting “Three Goods” Students in elementary and middle schools should be cancelled.

A．has to be held

B．has been held

C．has been holding

D．was held

题型：不详难度：| 查看答案