单项选择题

He can’t ______ ignorance as his excuse; he should have known what was happening in his own department.

A. insist
B. refer
C. plead
D. defend
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单项选择题
He can only blame himself for failing the exam. He（）harder during the year, but he seemed to go out with a different girl every weekend.

A. would have worked
B. should have worked
C. must work
D. ought to work
单项选择题
The arguments among the staff don’t ______ a good atmosphere in the office.
A. make for
B. get at
C. head for
D. build to
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