__,man could not live at all.A.were it not for the sun B.had it not been for the sun

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__,man could not live at all.A.were it not for the sun B.had it not been for the sun
__,man could not live at all.A.were it not for the sun B.had it not been for the sun

__,man could not live at all.A.were it not for the sun B.had it not been for the sun


 

综上所述,可知,选 A.

选A
此句考察的是虚拟语气的用法,因为主句中用的是could+动词原形,所以从句要对现在虚拟,所以用were,完整的句子应该是If it were not for the sun,放在句首省略if把were提前
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