◎ 题干
While watching television,         .
A.the doorbell rang
B.we heard the doorbell ring
C.there was someone knocking at the door
D.we heard the doorbell rung
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“While watching television, .A.the doorbell rangB.we heard the doorbell ringC.there was someone knocking at the doorD.we heard the doorbell rung…”主要考查了你对  【therebe句型】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。