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题型：单选题题类：常考题难易度：普通

【部分gb】北京航空航天大学实验学校2019-2020学年八年级下学期英语期末试卷

We will be lost ________ I drop white stones on the way.

A、until B、unless C、if D、although

举一反三

We need to get to the root(本质) of the problem we can solve it.

We did not go to Central Park last Sunday ________ the weather was too bad.

Betty kept silent at first _______ soon she joined the other girls, chatting and laughing.

The work was hard it took us quite a long time to do it.

— Jack, have you done the survey?

— Not yet. I am in New York now. I'll finish it ________________ I come back.

Hurry up, ______ we will miss the plane.

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