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

In order to study the s____in Russia ,Marx began to learn Russian in his sixties. 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 有没有in the year of.这种表达In____ Marx began to learn Russian.A the year of 1870 B the 1870's 答案B 可是A怎么不对? 英语单项选择,我要答案和讲解吖38.John hit Bob ___.A.in the faceB.on his face C.in faceD.by the face42.Marx began to learn Russian ___his fifties.A.inB.atC.forD.since Marx gave us some advice on how to learn fo__ languages. mary began to learn the english language 和mary began to learn english 都可以把? 1.Mrs Smith is ____friend of ___Athe mine B a me C the my D a mine2 Marx began to learn Russian in his ______A fivety B fifties C fiftieth D fiftys3 Cotton is grown in ___China A north B the north of C the north D a north 4 He is going to London by _ 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? I began to learn English three years ago.是什么时态 I began to learn English language three years before.改错? His father began to learn English in his forties We began to learn English two years ago.(Tom says) She began to learn to sing .(同义句改写)She () () learn to sing. we began to learn english three years ago 同义句____ ____ _____ ____ since we began to learn english. She began to learn ballet at six (改同义句） She began to learn ballet （）（）（）six. When Kari was over fifty,he began to learn Russian.When Kari was________ his ________,he began to learn Russian We began to learn English in 2000.to learn English的句子成分是什么? --in the 1870s that Marx stared to learn russian?A:Was it B:Were it C:Had it D:Did it