In ____, he began to learn Russian, when he was in ______.
A．1970; the 50’sB．the 1970; his 50s
C．the 1970s; his fiftiesD．1970s; his fifties
C

試題分析：句意：在十九世紀七十年代，當他已經(jīng)五十幾歲的時候，他開始學習俄語。固定詞組“在20世紀70年代” in the 1970's 和in the 1970s都可以，“在某人幾十歲的時候”in one’s+幾十的復數(shù)，如：in his 20s在他20幾歲的時候，所以選C。
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