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题型：单选题题类：易错题难易度：普通

While watching television, ____.

A、the doorbell rang B、we heard the doorbell ring C、there was someone knocking at the door D、the doorbell was ringing

举一反三

She was about to tell me the secret ________ someone patted her on the shoulder.

With a lot of difficult problems ________, the newly-elected president is having a hard time.

Busily {#blank#}1{#/blank#} (employ) in cleaning his shoes, he didn't notice my coming.

The young girl claimed {#blank#}1{#/blank#} (see) the robber in the street yesterday.

The speaker spoke so loudly in order to have his voice _____.

Some animals, in order to stop themselves {#blank#}1{#/blank#} (attack) by the enemies, go out for food at night.

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