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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