Scientists have tried many ways this prob- lem. A. solve B. to solve C. of solving D. both B and C 题目和参考答案——青夏教育精英家教网—

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2. Scientists have tried many ways this prob- lem.

A. solve B. to solve

C. of solving D. both B and C

2. D

2. D解析:way后面的定语有两种形式： to do 或 of doing,故选 D 项

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