问题描述：
20.mike was lucky enough to sell his second-hand car for exactly ________
A.what he had paid for it
B.what he was paid for it
C.how much had he paid for it
D.when he had paid for it
为什麼是A而不是C?
A.what he had paid for it
B.what he was paid for it
C.how much had he paid for it
D.when he had paid for it
为什麼是A而不是C?
问题解答：
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