Though Jack is only A7 years old Cbut he is clever Cenough to work out that puzzle Ddifficult even for a grown-up.

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问题 Though Jack is only A7 years old Cbut he is clever Cenough to work out that puzzle Ddifficult even for a grown-up.

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答案B

解析 去掉but。在含有though或although引导的让步状语从句中,主句中不再使用but。
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