_______ he was 12, Einstein had learned advanced mathematics by himself.
A．As soon asB．At the timeC．By the timeD．During the time
C

試題分析：考查連詞：A．As soon as一…就，B．At the time在…那個(gè)時(shí)候，C．By the time到…時(shí)候?yàn)橹�，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，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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