单选题
______, explorers could never have found the cave.
A、
But for the fissure had been spotted
B、
If not the fissure had been spotted
C、
Had the fissure not been spotted
D、
Had not the fissure been spotted
【正确答案】
C
【答案解析】
if条件句的虚拟语气，对过去事实的假设，省略了代词if，主谓部分倒装。句意：要不是裂缝被发现了，探险家们就不会找到山洞。
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