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(yǔ)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(qǐng)求比較中國(guó)和英國(guó)的教育體系的時(shí)候，他沒(méi)有給出答案。當(dāng)狀語(yǔ)從句的主語(yǔ)和主句主語(yǔ)一致，且含有be動(dòng)詞的時(shí)候，可以把狀語(yǔ)從句的主語(yǔ)和be動(dòng)詞一起省略。故C正確。
點(diǎn)評(píng)：當(dāng)狀語(yǔ)從句的主語(yǔ)與主句的主語(yǔ)一致，且狀語(yǔ)從句中有系動(dòng)詞be的時(shí)候，可以把狀語(yǔ)從句的主語(yǔ)和be動(dòng)詞一起省略。如果狀語(yǔ)從句中有it is的時(shí)候，it is 也可以省略。
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