______ he was 12, Einstein had learned advanced mathematics by himself.A．The fir_刷题宝

题干

______ he was 12, Einstein had learned advanced mathematics by himself.

A．The first time	B．At the time
C．By the time	D．During the time

上一题下一题 0.85难度单项选择更新时间:2018-04-09 02:15:03

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