Edison was a clever boy, and ______ he was fourteen, he had learned advance mathematics by himself.
A．whenever B．by the timeC．the moment D．ever since
Ｂ
考察時態(tài)。By the time到…時為止；根據(jù)he had learned advance mathematics by himself中的過去完成時，可知所選擇的連詞是與完成時連用的，結(jié)合句意可知Ｂ正確。句意：愛迪生是一個聰明的孩子。到他１４歲的時候，他已經(jīng)自學(xué)了高等數(shù)學(xué)。
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