David didn't give up ______ he had failed in the experiment four times．[ ]A. ifB. while C. thoughD.since-初中英语-n多题

◎ 题干

David didn't give up ______ he had failed in the experiment four times．

[ ]

A. if
B. while
C. though
D.since

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◎ 解析

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◎ 知识点

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