No doubt, robots are having a dramatic effect_________the labor market in this country.

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问题 No doubt, robots are having a dramatic effect_________the labor market in this country.

选项 A、in
B、over
C、on
D、with

答案C

解析 have an effect on sth.为固定搭配，意为“对某方面有影响”。故选C。

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