marx began to learn russian---------.A.in his fifties B.at his fifties C.at the age of fiftiesD.in the fifties 为什么

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• marx began to learn russian---------.A.in his fifties B.at his fifties C.at the age of fiftiesD.in the fifties 为什么
• marx began to learn russian---------.A.in his fifties B.at his fifties C.at the age of fifties
• When he was in his fifties Marx began to learn English.我想问的是 为什么 WHEN HE 后面跟的是WAS 而不是IS?这个叫什么从句?是不是后面从句用什么时态,前面主句就要用同样的时态?
• He began to work there （ ）.A.on his fifty B.at the age of fifty C.when he fifty D.in his fifties选D,but为什么?每个选项的区别是什么?PLEASE````````
• 英语单词连词成句：there no There are were computers like today（.）
• 英语单词 连词成句1)some to I school rules of for you parties want remind2)ID what to if I card forget bring happen my will3)I if don't it it now do do never will