题目内容
【题目】 David didn’t give up ______ he had failed in the experiment four times．
A. if B. while C. though D. since
【答案】C
【解析】此题考查连词，though引导让步状语从句，表示尽管。
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题目内容
【题目】 David didn’t give up ______ he had failed in the experiment four times．
A. if B. while C. though D. since
【答案】C
【解析】此题考查连词，though引导让步状语从句，表示尽管。
