单项选择题

A．When he was taking care of horses.
B．When he was given an opportunity to play a part on the stage.
C．When he began play-writing.
D．When he had written many plays.
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单项选择题
The reason why studying the nature of human beings is popular is that.
A．the scale and scope of it is unprecedented
B．it is useful for determining policy
C．it is still an area of great mystery
D．there are so many best selling books about it
单项选择题
A．Inflexible.B．Diligent.C．Bulky.D．Bright.
A．Inflexible.
B．Diligent.
C．Bulky.
D．Bright.
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