题目内容

I have trouble ________ the new words.
A．memorizeB．to memorizeC．memorizingD．memorized
C

试题分析：句意：我记住这几个新单词有困难。短语have trouble in doing sth动名词做介词in的宾语，做某事有困难，实际中常胜率介词in，故选C。
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