单项选择题

We have not obtained very much experiment data ______ conclusion between the two possibilities.

A．on which to base
B．to base on
C．which is based on
D．to be based on
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单项选择题
The only ______ before him which be felt himself to be incapable of contemplating was the prospect of leaving Emily.
A．outlook
B．prospect
C．attitude
D．view
单项选择题
Peter felt very guilty for not being able to reunite with his family on Christmas Eve, so he decided to ______. He wanted to work till midnight.
A．work it over
B．work it out
C．work it off
D．work it up
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