单项选择题

The professor can hardly find sufficient grounds ______ his argument in favour of the new theory.

A. for which to base

B. on which to base
C. which to be based on

D. which to base on
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单项选择题
Scarcely ______ when it began to rain.
A. did he return


B. had he returned
C. he did return


D. he had returned
单项选择题
______ he works hard, I don’t find when he finishes the experiment.
A. As soon as B. As well as
C. So long as
D. So far as
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