【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(shí)候，B．At the time在…那個(gè)時(shí)候，C．By the time到…時(shí)候?yàn)橹梗?/span>D．During the time在那期間，四個(gè)選項(xiàng)BD不能做連詞，A的意思不對(duì)，選C，句意：到他12歲為止，愛(ài)因斯坦已經(jīng)自學(xué)了高等數(shù)學(xué)。選C。

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