单项选择题

For customer convenience，the manual is available______both microfilm and book forms.

A.on
B.to
C.in
D.for

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单项选择题

Group-thinking occurs when people are either isolated from crucial sources of information or______by other members of the group， some of whom may have bad intent.

A.occupied
B.presided
C.operated
D.dominated

单项选择题

I have to admit that， although I still find him rather arrogant， he has gone up ______ my estimation recently.

A.to
B.in
C.for
D.at

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