When ____ to compare the education system of China and Britain, the professor gave no answer．
A．a(chǎn)skB．a(chǎn)skingC．a(chǎn)skedD．to ask
C

試題分析：連詞狀語從句的省略。本題在when后面省略了the professor was；句意：當(dāng)這位教授被請求比較中國和英國的教育體系的時候，他沒有給出答案。當(dāng)狀語從句的主語和主句主語一致，且含有be動詞的時候，可以把狀語從句的主語和be動詞一起省略。故C正確。
點評：當(dāng)狀語從句的主語與主句的主語一致，且狀語從句中有系動詞be的時候，可以把狀語從句的主語和be動詞一起省略。如果狀語從句中有it is的時候，it is 也可以省略。
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