I know it’s normal for such a thing to happen, but we _____ it if we’d been more careful.
A．need have avoidedB．could have avoided
C．will have avoidedD．had avoided
B

試題分析：考查虛擬語氣：句意：我知道這樣的事情發(fā)生是很正常的，但是如果我們更小心點本來是可以避免的。根據(jù)從句if we’d been more careful.可知是和過去相反的虛擬語氣，主句用could have done，need have done本來需要做…而沒有做，will have done是將來完成時，had done是過去完成時，選B。
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