I first met Mr Smith in America. He at Stanford University then.A. studiedB. had studiedC

问题补充：

I first met Mr Smith in America. He at Stanford University then.

A. studied

B. had studied

C. is studying

D. was studying

答案：

A. studied

B. had studied

C. is studying

(答案→)D. was studying

解析：考查时态：句意：我第一次是在美国见到斯密斯先生的，当时他正在斯坦福大学学习。可知学习这个动作是发生在then，也就是：I first met Mr Smith in America，用过去进行时，表示过去正在做的动作。选D。

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