—What courses are you going to do next term?—I don’t know. But it’s about time on someth

问题补充：

—What courses are you going to do next term?

—I don’t know. But it’s about time on something.

A. I’d decide

B. I decided

C. I decide

D. I’m deciding

答案：

A. I’d decide

(答案→)B. I decided

C. I decide

D. I’m deciding

解析：因为It’s (high /about) time后面的从句的谓语动词通常用过去时态。