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问题

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

A:has been used
B:have been used
C:is used 
D:are used
正确答案是:
同类题型

What’s the weather like tomorrow—I have no idea. Just a minute, I ________ it for you.

When John woke up he was in the hospital, but he didn’t know how that had

You _____ hurt your stomach if drinking beer whilehaving sea food.

We haven’t dicussed yet _______ we are going to place our new furniture

There is no doubt _____ man will continue to explore the vast universe in the future, but the rate at which we approach depends on the development of technology.[ ]

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