David didn’t give up he had failed in the experiment four timesA. ifB. whileC. thoughD.

发布时间：2020-08-21 09:35:31

David didn’t give up      he had failed in the experiment four times．
A. if
B. while
C. though
D. since

网友回答

A. if
B. while
(答案→)C. though
D. since
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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