Although we’ve learned English for years, we have trouble _____ the foreigners.A.understandB.to understandC.understandingD.of understanding
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C解析试题分析：考查固定短语have trouble in doing sth (in可省略)，做某事有麻烦。故选C。
考点：固定短语have trouble in
点评：have trouble in doing sth (in可省略)，做某事有麻烦。英语中这样的短语很多，需要牢记这些用法。