--Our environment（環(huán)境）is getting worse than before．

--You're right．But people have done more and more useful things to protect the earth since Earth Day _______．

A．is started           B．was started           C．has started         D．started

1、B

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--Our environment（環(huán)境）is getting worse than before．

--You're right．But people have done more and more useful things to protect the earth since Earth Day _______．

A．is started           B．was started           C．has started         D．started

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