单项选择题

Though eight years have passed, I still remember（）to Mr. Ma during my visit there.

A. introducing
B. being introduced
C. to be introduced
D. introduced

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单项选择题
So little（）about China that he could not find Beijing in the world map.

A. the foreigner knew
B. did the foreigner know
C. the foreigner has known
D. has the foreigner known
单项选择题
The President of Harvard pioneered the elective system by（）students were able to choose their own courses of study.

A. what
B. whom
C. that
D. which
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