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【题目】Pollution has already destroyed much of the Earth. Only by changing ______ we live can we save our planet.

A. where B. how C. what D. why

【答案】B

【解析】

考查主语从句。句意:污染已经摧毁了地球的大部分。只有改变我们的生活方式,我们才能拯救我们的地球。句子缺少主语,结合句意此处是how引导的主语从句,故答案为B。

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