单项选择题

That will be （） useful reference book in my research.

A．a
B．an
C．the
D．/

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单项选择题

（）you don't like him is none of my business.

A．Who
B．That
C．What
D．Whether

单项选择题

Jim went to his hometown yesterday. He （） there already.

A．must arrive
B．may arrive
C．may have arrived
D．would arrive

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