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

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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