Sam has little trouble ______ the tires of his car.

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问题 Sam has little trouble ______ the tires of his car.

选项 A、to fix
B、fix
C、fixing
D、with fixing

答案C

解析 考查固定用法。have trouble doing sth.意为“做某事有困难”,动词直接用现在分词形式就可以了,故选C。
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