(2013·咸陽二模)We should keep in mind that the earth is our only home and only by saving the environment________ourselves.
A．we can save　B．can we save
C．we must save　D．must we save
B
考查倒裝。句意為：我們需要銘記的是，地球是我們唯一的家園，只有拯救環(huán)境才能拯救我們自己。分析句子結(jié)構(gòu)可知，only置于分句句首，故用部分倒裝結(jié)構(gòu)。
答案：　B
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