________ every student aware of the importance of study, they would study efficiently.
A．WereB．ShouldC．MayD．Had
B
考查省略及倒裝，此題是表示與將來(lái)相反的虛擬語(yǔ)氣，省略if，should 前提，正常語(yǔ)序?yàn)镮f every studen should aware of the importance of study，句意：如果每一個(gè)學(xué)生意識(shí)到學(xué)習(xí)的重要性，他們就會(huì)有效的學(xué)習(xí)。所以選B。
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