单项选择题

A．disappointing
B．dull
C．frightening
D．sudden
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单项选择题
A．accidentB．affairC．experienceD．trouble
A．accident
B．affair
C．experience
D．trouble
单项选择题
When can the student leave
A. The student can’t leave unless he has put everything back in the cupboard.
B. The student can leave after he turns off the electricity.
C. The student can leave after he has tidied the lab.
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