专四
A．must make
B．must have made
C．was able to make
D．could make
情态动词的含义和用法。本句是陈述过去事实，而A．must多指现在或将来的情况，一般不用来表示过去必须做某事，据此排除。B．must have done sth．表示对过去行为的推测、猜想，不一定是事实，与句意不符。D．could指“一般的能力”，通常不表示某人在某一场合设法做了某事，故不正确。C．was able to专用于过去的具体场合，尤其指“具有能力完成某件有难度的事情”，因此C是正确答案。
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