He ___________ the test, but he wasn’t careful enough.
A．was able to passB．must have passedC．could have passedD．might be able to pass
C
考查虛擬語氣。句意：他本來能夠通過考試，但是他不夠細心�！皐ould+have+done”表示對過去事情的假設(shè)，表示本來會做而沒有做的動作。聯(lián)系句子意思可知選C。
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