Edison was a clever boy, and ______ he w...

Edison was a clever boy, and ______ he was fourteen, he had learned advance mathematics by himself.

A．whenever

B．by the time

C．the moment

D．ever since

Ｂ【解析】考察时态。By the time到…时为止；根据he had learned advance mathematics by himself中的过去完成时，可知所选择的连词是与完成时连用的，结合句意可知Ｂ正确。句意：爱迪生是一个聪明的孩子。到他１４岁的时候，他已经自学了高等数学。

考点分析：

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