When doing my homework,________.
A．I heard the doorbell ringB．the doorbell rang
C．my mother came inD．my mother was cooking
A

試題分析：考查狀語從句的省略和賓語補(bǔ)足語：句意：當(dāng)做作業(yè)的時候，我聽見門鈴響了。“while”后接的是現(xiàn)在分詞短語，在句中作狀語，它邏輯上的主語應(yīng)該是我，不是the door，也不是my mother，又因為hear后接復(fù)合賓語時，這個復(fù)合賓語應(yīng)包含一個省略to的動詞不定式或現(xiàn)在分詞短語。所以本題選A項。
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