单项选择题

The foreign friends were all amazed to see ______ here in the past several years.

A．how great changes has taken place
B．what changes had taken place
C．how changes had taken place
D．what have changed

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单项选择题

______ too often in many bookstores, the book did attract a large readers when it was broadcast on television.

A．Having sold
B．Being sold
C．Having been sold
D．To have been sold

单项选择题

If I ______ how terrible the job was going to be, I wouldn t have accepted it.

A．realized
B．was realized
C．had realized
D．did realize

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