If you don’t study English all the time you’ll have a difficult time it in the future.A

问题补充：

If you don’t study English all the time, you’ll have a difficult time it in the future.

A. studying

B. to studying

C. studied

D. be studying

答案：

(答案→)A. studying

B. to studying

C. studied

D. be studying

解析：本题是固定词组搭配，即主语+have a adj time doing sth，故选A