i had a little trouble____english grammarA learn B learned C learning D to learn怎么选,为什么

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ihadalittletrouble____englishgrammarAlearnBlearnedClearningDtolearn怎么选,为什么ihadalittletrouble____engl

i had a little trouble____english grammarA learn B learned C learning D to learn怎么选,为什么
i had a little trouble____english grammar
A learn B learned C learning D to learn
怎么选,为什么

i had a little trouble____english grammarA learn B learned C learning D to learn怎么选,为什么
C
没有为什么,只要记住 I have trouble 后面一定要跟着动词的 ing形.
e.g.
I have trouble concentraing in class.
我很难上课时集中思想.