题目
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
核心考点
试题【Every possible means _______to prevent the air pollution, but the sky is still n】；主要考察你对一般现在时等知识点的理解。[详细]
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 |
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 |
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 |
— 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 |
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 |
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