【題目】______ he was 12, Einstein had learned advanced mathematics by himself.

A. The first time B. At the time

C. By the time D. During the time

【答案】C

【解析】考查連詞：A．The first time第一次做---的時候，B．At the time在…那個時候，C．By the time到…時候為止，D．During the time在那期間，四個選項BD不能做連詞，A的意思不對，選C，句意：到他12歲為止，愛因斯坦已經(jīng)自學(xué)了高等數(shù)學(xué)。選C。

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