单项选择题

Educational TV stations offer teaching in various ______ ranging from home nursing to art appreciation.

A．courses
B．directions
C．points
D．subjects
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单项选择题
John's score on the test is the highest in the class; he ______ last night.
A．must study
B．should have studied
C．must have studied
D．is sure to study
单项选择题
Can you ______ any smell of the gas which is escaping
A．discover
B．detect
C．find
D．spot
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