题目内容

The house, _____ was destroyed in the terrible fire, has been repaired.

A. the roof of which
B. which roof
C.its roof
D. the roof

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The matter _____ you were arguing about last night has been settled.

A.that
B. what
C. why
D.for which

Who _____ has common sense will do such a thing?

A. which
B. who
C. whom
D. that

从原点出发的射线与TVC相切的产量上不存在（）。

AVC最小
B. MC=AVC
C. MC最小
D. MC处于上升阶段

从原点出发的射线在与TC曲线相切的产量上，必有（）。

AVC最小
B. MC=AVC
C. ATC最小
D. MC最小