单项选择题

A．down
B．beneath
C．below
D．off
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单项选择题
A．studiedB．surveyedC．researchedD．observed
A．studied
B．surveyed
C．researched
D．observed
单项选择题
A．amongB．inC．betweenD．to
A．among
B．in
C．between
D．to
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