问题补充:
David doesn’t give up he has failed in the experiment four times.
A. if
B. while
C. though
D. since
答案:
A. if
B. while
(答案→)C. though
D. since
解析: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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