— _______ was it invented?— It was invented _______ accident.A．When; inB．When; b_刷题宝

题干

— _______ was it invented?
— It was invented _______ accident.

A．When; in

B．When; by

C．How; in

D．How; by

上一题下一题 0.65难度单选题更新时间:2019-10-06 07:44:29

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