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