题目内容：
31.In _, my grandfather joined the Red Army.A. the 1930s. B. 1930.s C. 1930s. D. the 1930.s
参考答案：
选择题：31.In _, my grandfather joined the Red Army.A. the
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A. the 1930s. B. 1930.s C. 1930s. D. the 1930.s