单项选择题

He was the only one of the boys（）praised.

A．who was
B．who were
C．who is
D．who are

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单项选择题
She was happy（）with her aunt since she was five years old.

A．having stayed
B．having been staying
C．to stay
D．to have been staying
单项选择题
Every one can only play the games for ten minutes（）

A．at a time
B．at any time
C．at times
D．at one time
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