The coasted areas have mild winters, but the central plains bee extremely cold.
A. by contrast
B. with contrast
C. contrast
D. contrasting
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(答案→)A. by contrast
B. with contrast
C. contrast
D. contrasting
解析:句意,沿海地区有着温和的冬天,但是相比之下,中部平原的冬天就极端寒冷。by contrast相比之下,这是一个固定用法。