Nothing terrible has happened—because we should certainly have been informed of it if it ______.
A、
should happen
B、
happened
C、
would have happened
D、
had happened
【正确答案】
D
【答案解析】
破折号之前的句子用现在完成时，是对过去事实的陈述。破折号后的句子是对过去事实的虚拟，因此条件句用过去完成时，选D。
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