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
B
本題前半部分是虛擬，“本來會燒毀的”，后半部分是陳述語氣，表示實際情況，而且是過去發(fā)生的事情，用could +現(xiàn)在完成時和過去時。
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