问题 选择题
The whole building _____ burned down, but the heavy rain _____.
A.might have; would help
B.could have been; helped
C.must have; helped
D.should have been; was helping
答案

B

本题前半部分是虚拟,“本来会烧毁的”,后半部分是陈述语气,表示实际情况,而且是过去发生的事情,用could +现在完成时和过去时。

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单项选择题