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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

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You will not be allowed to get into the plane_______ you pass security checks(安检).

She's not strong enough walking up mountains.

—_____ my daughter is only ten years old, she knows a lot.

—What a clever girl!

Bob and Jim have been good friends {#blank#}1{#/blank#} (自从) they joined the same tennis team.

New types of English are common _________ English is spoken.

I was doing my homework ______ my mum was cooking in the kitchen.

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