While having our dinner, _______. 
A．the door bell rang
B．our newspapers came to the door
C．we heard the door bell ringing
D．the postman brought several letters to us
C

試題分析：觀察句子結(jié)構(gòu)從句為連詞+現(xiàn)在分詞，說明是狀語從句的省略，根據(jù)狀語從句的省略的條件：主句和從句的主語應(yīng)一致，又因?yàn)槭乾F(xiàn)在分詞，故主句的主語應(yīng)和have構(gòu)成主動(dòng)關(guān)系，故排除AB，CD主語為人，均可以和have構(gòu)成主動(dòng)關(guān)系，但D答案不合邏輯，句意。句意，當(dāng)我們正在吃飯時(shí)，門鈴響了。
點(diǎn)評：狀語從句的省略同時(shí)具備下列兩個(gè)條件:①主句和從句的主語一致，或從句主語為it；②從句主要?jiǎng)釉~是be的某種形式。從句中的主語和be動(dòng)詞常可省略。
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