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题型:单选题 题类:常考题 难易度:普通

黑龙江省哈尔滨市宾县一高2020-2021年高一下学期5月第二次月考英语试卷

—____ was it ____ Franklin proved that lightning is a form of electricity.

—By flying a kite with a metal key attached to the string.

A、What, that B、How, that C、When, that D、Where, that
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