【題目】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】

考查主語從句。句意:污染已經(jīng)摧毀了地球的大部分。只有改變我們的生活方式,我們才能拯救我們的地球。句子缺少主語,結(jié)合句意此處是how引導(dǎo)的主語從句,故答案為B。

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