第1个回答 2010-11-04
When I have trouble/difficulty in studying
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第2个回答 2010-11-04
when I have a difficult in learning.
第3个回答 2010-11-04
When I have trouble in studing,
第4个回答 2010-11-04
When I have trouble in studying本回答被提问者采纳
第5个回答 2010-11-04
when i have difficulties in learning,