[题目]Having failed my French exam,I decided to concentrate science subjectsA.toB.uponC.inD.at 题目和参考答案——青夏教育精英家教网—

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【题目】Having failed my French exam,I decided to concentrate___science subjects

A.to

B.upon

C.in

D.at

【答案】B

【解析】句意：法语考试失利后，我决定集中学理科科目。concentrate on/upon为固定短语，专注于……

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