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
A free lookout ______ the hills with binoculars.
A．scanned
B．scrutinized
C．explored
D．swept
单项选择题
Gently ______ her words were spoken, there was no mistaking that she was displeased.
A．if
B．while
C．as
D．though
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