19. By the time he was fourteen,Einstein                advanced  mathematics all by himself.(learn)

愛(ài)因斯坦到十四歲時(shí)就自學(xué)完了高等數(shù)學(xué)。

19. had learned考查by the time引導(dǎo)的時(shí)間狀語(yǔ)從句 by the time意為"到. 時(shí)為止"，主句一般要用完成時(shí)態(tài)。從句為一般過(guò)去時(shí)，主句要用過(guò)去完成時(shí)。

題目來(lái)源：高考丟分題英語(yǔ) > 專題訓(xùn)練8:狀語(yǔ)從句

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