What were you doing ______ I knocked at the door？
I was sleeping．（ ）
A．unlessB．onceC．whenD．while
相关试题
Friends are like books． You don't need a lot of them they are good． （ ）
A．orB．andC．as long asD．as soon as
【知识点思维导图】
【典例分析】
______ special classes we had! We have learned a lot about paper cutting． （ ）
A．WhatB．What aC．How aD．How
The English Speech Competition the best in her． As a result， she is more active now． （ ）
A．checked outB．tried out
C．left outD．brought out
My brother has a healthy living habit． He stays up late， and he is an early bird． （ ）
A．usuallyB．hardlyC．oftenD．always
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