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

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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
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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