He at that school a year ago.A. studiesBstudyC. studyingD. studied

问题补充：

He at that school a year ago.

A. studies

Bstudy

C. studying

D. studied

答案：

A. studies

B. study

C. studying

(答案→)D. studied

解析：根据题目中的时间状语a year ago，可以知道动作发生在过去，选择D。

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