问题
选择题
—Was the boy saved?
—No. The doctors tried their best, _____ they failed. [ ]
A. and
B. or
C. but
D. so
答案
答案：C
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—Was the boy saved?
—No. The doctors tried their best, _____ they failed. [ ]
A. and
B. or
C. but
D. so
答案：C