9、--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
科目：初中英語 來源： 題型：
--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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