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

【答案】C
【解析】考察介詞辨析,句意:David 沒有放棄,盡管他的實(shí)驗(yàn)已經(jīng)失敗了四次,A如果,B當(dāng)……,C盡管,D自從……,故選C。

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