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：愛迪生是一個非常聰明的孩子，到他14歲的時候，他就已經(jīng)自學(xué)了高等數(shù)學(xué)了。句中有had learned為過去完成時，四個選項中只有by the time到…為止，其后的句子要用過去完成時，故選B
考點：連詞與時態(tài)匹配
點評：動詞時態(tài)是高考必考語法點，理解各種時態(tài)的含義，用法是解答本題的基礎(chǔ)。英語中很多時態(tài)的題目，句中并沒有明確的時間狀語，需要根據(jù)語境和語義進(jìn)行判斷，這點在平時的練習(xí)中要多理解和總結(jié)，在備考中自己要有意識的掌握時態(tài)之間的區(qū)別。

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