单项选择题

  The scientist could hardly find sufficient grounds ______ his arguments in favor of the new theory.

A.to be based on
B.to base on
C.which to base on
D.on which to base
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单项选择题
As it turned out to be a small house party, we ______ so formally.
A.need not have dressed up
B.must not have dressed up
C.did not need to dress up
D.must not dress up
单项选择题
John’s score on the test is the highest in the class. He ______.
A.should study
B.should have studied last night
C.must have studied last night
D.need study last night
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