题目

_________, when Marx was already ________, he began to learn Russian. A. In 1870s; in his fifties                B. In 1870s; in fifties C. In the 1870s; in his fifties          D. In the1870s; in fifties 答案：Cno modern technology, the Egyptians had to move each stone by hand.     A. It being     B. There being          C. There was            D. Being