It is not easy________a foreigner to learn to speak Chinese.
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答案C 分析:动词不定式也有其动作执行者.I want to go there.中的to go在句子中担任宾语,其动作执行者是句子的主语I.I want him to go there.中的to go在句子中担任宾语him的补语,其动作执行者是句子的宾语him....