题目内容
________________when Marx was in his fifties, he began to learn Russian.
A. In 1870s
B. In 1870’s
C. In the 1870’s
D. In his 1870’s
In ________ 1870’s, Marx found ________ important to study the situation in Russia, so he began to learn Russian．
A．/; it
B．the; that
C．/; that
D．the; it
In _____ 1870’s Marx found it important to study _____ situation in Russia.
A. a; the B. an; a C. / ; / D. the; the
