David doesn’t give up _______ he has failed in the experiment four times.
A．ifB．whileC．thoughD．since
C
連詞辨析。if 是否，如果；while當(dāng)……時(shí)，然而；though雖然，盡管；since自從……以來(lái)，由于。句意：盡管他在實(shí)驗(yàn)中已經(jīng)失敗了四次，但是戴維德還不放棄。故選C。
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