综合运用一般过去时描述成长 — 英语选择题

选择能正确表达“去年我还不会骑自行车，后来学会了”的句子。A. Last year, I couldn't ride a bike, but I learned later. B. Last year, I can't ride a bike, but I learned later. C. Last year, I couldn't ride a bike, but I learn later. D. Last year, I didn't can ride a bike, but I learned later.