10. I’d like to know ________ Chinese.
A.when he began to learn
B.when did he begin to learn
C.when did he begin learning
D.for how long he began to learn
正确答案是A
10. I’d like to know ________ Chinese.
A.when he began to learn
B.when did he begin to learn
C.when did he begin learning
D.for how long he began to learn
正确答案是A