(2014·湖南六校聯(lián)考)I know it’s normal for such a thing to happen，but we________it if we’d been more careful.
A．need have avoided　B．could have avoided
C．will have avoided　D．had avoided
B
考查虛擬語(yǔ)氣。句意為：我知道發(fā)生這樣的事情是正常的，但如果我們更小心一點(diǎn)兒的話，這樣的事是可以避免的。根據(jù)句中的“if we’d been more careful”可知，此處表示與過去事實(shí)相反的假設(shè)，故用could/might/would have done結(jié)構(gòu)。
答案：　B
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