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