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  3. A few years ago, computers were used onl

A few years ago, computers were used onl

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问题 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.thoughB.whereasC.soD.therefore
选项 A.though
B.whereas
C.so
D.therefore
答案 B
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。
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