Though he had been trained for three months he didn’t pass the exam.A. butB. andC. stillD.

问题补充：

Though he had been trained for three months,he didn’t pass the exam.

A. but

B. and

C. still

D. so

答案：

A. but

B. and

(答案→)C. still

D. so

解析：连词辨析。A. 但是 B. 和；并且 C. 仍旧 D. 因此。句意：尽管他培训了三个月，但是仍旧没有通过考试，故选C。