问题补充:
By the time I was nine ,I hundreds of English words.
A. had learned
B. have learned
C. has been learned
D. had been learned
答案:
(答案→)A. had learned
B. have learned
C. has been learned
D. had been learned
解析:句意:到我九岁的时候,我就学会几百个英语单词了。by the time 后跟从句,表示到…时候,从句中常用一般过去时,主句用过去完成时。而且I和learn 之间是主动的关系,不应该用被动语态,故C、D不对。B选项是现在完成时。故选A。