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题型：单选题题类：模拟题难易度：普通

He was just falling asleep _____ there was a loud knock on the door.

A、while B、when C、then D、until

举一反三

Steve gets on well with his classmates he has been in this class for only one month

—Alice, how do your parents like pop music?

— my dad my mum likes it. But they both prefer Beijing Opera.

My grandparents wrote letters to keep in touch with others they were young.

Switzerland is very small, it is the land of watch and it is very rich.

My aunt is a writer. She has written more than ten books s{#blank#}1{#/blank#} 1980.

The students have to stay in the classroom the rain is heavy now.

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