If you have any difficulty ____ how to skate, you can turn to Jacky.
A．learnedB．to learnC．learningD．learn
C

試題分析：考查詞組：have difficulty in doing干…有困難，句意：如果你學(xué)習(xí)溜冰有困難，你可以求助于Jacky。選C。
點(diǎn)評(píng)：英語中有的詞組的to是介詞，不是不定式，所以不能加動(dòng)詞原形，用動(dòng)名詞，如：look forward to doing，get down to doing等。
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