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クイズ problem-solving 10

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この練習では、肯定文を読み、その否定を正しく表現する文を選びます。

👑C2 - level.proficiency

1. She discovered a novel approach to solving the problem.

A.She did not discovered a novel approach to solving the problem.B.She has not discovered a novel approach to solving the problem.C.She did not discover a novel approach to solving the problem.D.She was not discovering a novel approach to solving the problem.

⭐B2 - level.upperIntermediate

2. There is an effective solution to the problem.

A.There is not an effective solution to the problem.B.There is no effective solution to a problem.C.There isn't an ineffective solution to the problem.D.There is an ineffective solution to the problem.

🚀C1 - 上級

3. He found the answer to a difficult mathematics problem.

A.He did not find the answer to a difficult mathematics problem.B.He did not find answer to a difficult mathematics problem.C.He did not find the answers to a difficult mathematics problem.D.He did not found the answer to a difficult mathematics problem.

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