Repairing the old copy machine would have______half as much as buying a new one.

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问题 Repairing the old copy machine would have______half as much as buying a new one.

选项 A、lasted
B、cost
C、spent
D、paid

答案B

解析 根据句意可知cost“花费(金额)”最恰当。句子的时态是过去将来完成时,故would have后面的空格应填入cost的过去分词,cost的原形、过去式和过去分词同形。
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