While doing my homework，________.

A．I heard the doorbell ring

B．the doorbell rang

C．my mother came in

D．my mother was cooking

 

A

只有當(dāng)狀語(yǔ)從句的主語(yǔ)與主句主語(yǔ)一致時(shí)，才能省略從句中的主語(yǔ)和be動(dòng)詞，所以主句主語(yǔ)必須是I，因此選A項(xiàng)。

 

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