Since computers were introduced, they_______to be useful tools for people weak in math.

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问题 Since computers were introduced, they_______to be useful tools for people weak in math.

选项 A、had proved
B、have proved
C、will prove
D、are proving

答案B

解析句意：自电脑问世以后，它们已被证明对数学薄弱的人们来说是有用的工具。since 引导的从句中的动词为一般过去时，主句用现在完成时，故选B。

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英语

成考专升本

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