单项选择题

Both approaches require that the actor（）his or her own personal values as well as the character' s.

A．must understand
B．should understand
C．has to understand
D．need to understand

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单项选择题
I have two elder brothers,（）in the army for ten years.

A．the elder of whom served
B．the older having served
C．the older of which served
D．the elder one has served
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