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题文

—Will you give me a hand? I have some trouble_______ the scientific problem.
—Don't worry. I'll try my best to help you _______.

A.solving; in five minutes
B.to solve; in five-minute
C.to solve; after five minutes
D.solving; after five-minutes
科目 英语   题型 单选题   难度 中等
知识点: 主语+系动词+表语 介词短语
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