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

解析試題分析：句意：愛(ài)迪生是一個(gè)非常聰明的孩子，到他14歲的時(shí)候，他就已經(jīng)自學(xué)了高等數(shù)學(xué)了。句中有had learned為過(guò)去完成時(shí)，四個(gè)選項(xiàng)中只有by the time到…為止，其后的句子要用過(guò)去完成時(shí)，故選B
考點(diǎn)：連詞與時(shí)態(tài)匹配
點(diǎn)評(píng)：動(dòng)詞時(shí)態(tài)是高考必考語(yǔ)法點(diǎn)，理解各種時(shí)態(tài)的含義，用法是解答本題的基礎(chǔ)。英語(yǔ)中很多時(shí)態(tài)的題目，句中并沒(méi)有明確的時(shí)間狀語(yǔ)，需要根據(jù)語(yǔ)境和語(yǔ)義進(jìn)行判斷，這點(diǎn)在平時(shí)的練習(xí)中要多理解和總結(jié)，在備考中自己要有意識(shí)的掌握時(shí)態(tài)之間的區(qū)別。

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