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单选题
A few years ago, computers were used only in business, in medicine, and for scientific research, _____ these days they are common in almost all schools.
A
though
B
whereas
C
so
D
therefore
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参考解析
解析：
句意：几年前计算机仅仅应用在商业、医药和科学研究领域，然而现在它们几乎在所有的学校都非常普遍。whereas连接的是两个并列分句，表示现在和过去的对比。
句意：几年前计算机仅仅应用在商业、医药和科学研究领域，然而现在它们几乎在所有的学校都非常普遍。whereas连接的是两个并列分句，表示现在和过去的对比。
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