（2016•黄石）- What were you doing ______ I knocked at the door?- I was sleeping.

题型：单选题题类：常考题难易度：普通

湖北省2017届九年级英语专题练习：连词

- What were you doing ______ I knocked at the door?

- I was sleeping.

A、unless B、once C、when D、while

举一反三

-- I'd love to. I'm afraid I have no time.

— It will be worse we take action to protect the environment.

—The relationship ____China ____Russia will be closer than before, I think.

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