He paid for a seat, when he _________ have entered free.  
A．couldB．wouldC．mustD．need
A
could have done的意思是“本來(lái)可以做某事”。句子語(yǔ)境為“雖然他本來(lái)能夠免費(fèi)入場(chǎng)，但他買了票”。
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