单项选择题

I don’t understand this point of grammar．I wish I （） it better．

A．understand
B．understood
C．would understand
D．had understood

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单项选择题
—I went to the museum you introduced to me yesterday.—Oh, did you （）.

A. So I did
B. So did I
C. Either I did
D. Either did I
单项选择题
I saw（）man going into the office．I don’t know who （） man was．

A．-/the
B．the/a
C．a/the
D．a/a
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