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【题目】Mom, don’t you think it's OK to play once in a while it doesn’t affect my studies?

A. even if B. unless

C. so that D. as long as

【答案】D

【解析】

试题分析:考查状语从句。A. even if 即使;B. unless除非;C. so that 为了---D. as long as只要。

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