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
It is unusual for there ______ so few students in the classroom.
[A] to be
[B] be
[C] being
[D] are
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