. ---Learning a language isn’t easy. It takes time.---I agree. . There is no short cut.A.

问题补充：

. ---Learning a language isn’t easy. It takes time.

---I agree. . There is no short cut.

A. All roads lead to Rome

B. Rome was not built in a day

C. Practice makes perfect

D. Slow but sure wins the race

答案：

A. All roads lead to Rome

(答案→)B. Rome was not built in a day

C. Practice makes perfect

D. Slow but sure wins the race

解析：考查谚语。A. 条条大路通罗马 B.伟业非一日之功

C. 熟能生巧 D.稳扎稳打。句意：学会一种语言不容易，它需要时间。——我完全同意，结合下文没有捷径，可知选B最符合语境。