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David doesn’t give up _______ he has failed in the experiment four times.
A.ifB.whileC.thoughD.since
C
连词辨析。if 是否,如果;while当……时,然而;though虽然,尽管;since自从……以来,由于。句意:尽管他在实验中已经失败了四次,但是戴维德还不放弃。故选C。
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