When__________ to compare the education of China and Britain, the professor gave noanswer.
2023-05-26
A.ask
B.asked
C.asking
D.to ask
参考答案:B
B.asked
C.asking
D.to ask
参考答案:B
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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