题目内容
10．-How much does it cost？-I justpaid five dollars for it．
分析 -它值多少钱呢？
-我只花了5美元．
解答 答案：paid 花费的短语 和词语有人作主语--pay for，spend/spend on；cost--物作主语；根据-I just____ five dollars for it中的on可知用pay，但是已经付完钱了，所以用过去时，故答案是paid
点评 要联系表示"花费"的词语和短语，结合时态解答．
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