When to compare the education of China and Britain，the professor gave no answer．

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问题 When to compare the education of China and Britain，the professor gave no answer．

选项 A、ask
B、asked
C、asking
D、to ask

答案B

解析当被问到比较中国和英国的教育，教授没有给出答案。此处when asked中省略了he was。把时间状语从句简化为过去分词作状语，故选B。

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