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
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单项选择题
Why does the author mention the Sierra Nevada in line 10
A．To argue that a mom direst route to the West could have boon taken,
B．To identify a historically significant mountain range in the Went,
C．To point out the legation of n serious train accident,
D．To give an example of an obstacle faced by the central pacific.
单项选择题
Farmers are allowed to grow small gardens of their own and they sell their vegetables ______ the black market.
A．on
B．at
C．in
D．for
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