When__________ to compare the education

tikufree2019-12-17  16

问题 When__________ to compare the education of China and Britain, the professor gave noanswer.

选项 A.askB.askedC.askingD.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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