David didn’t give up ______ he had failed in the experiment four times.
A．ifB．whileC．thoughD．since
C
考查狀語(yǔ)從句。句意“大衛(wèi)沒(méi)有放棄，盡管他做實(shí)驗(yàn)已經(jīng)失敗四次了。”A引導(dǎo)條件狀語(yǔ)從句；B引導(dǎo)時(shí)間狀語(yǔ)從句；C引導(dǎo)讓步狀語(yǔ)從句；D引導(dǎo)原因狀語(yǔ)從句。故選C。
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