题目内容

序数效用论认为效用人际可比。()

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_____caused the accident has not yet been found.

A. Which
B. Whichever
C. What
D. Whatever

I think it advisable that an armed guard_____in readiness.

A. is standing
B. will stand
C. stands
D. stand

Child_____he was, he knew that was the right thing to do.

A. as
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C. that
D. like

试述六腑之间的关系。