单项选择题

You ______ her in her office last Friday; she' s been out of town for two weeks.

A. needn' l have seen
B. must have seen
C. might have seen
D. can' t have seen
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单项选择题
A completely new situation is likely to ______ when the school leaving age is raised to 16.
A. arouse
B. rise
C. arise
D. abide
单项选择题
The illness from which Mary is suffering has now been ______ as hepatitis(肝火).
A. diagnosed
B. determined
C. deduced
D. discovered
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