单项选择题

A．way
B．means
C．method
D．approach
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单项选择题
A．althoughB．becauseC．even thoughD．if
A．although
B．because
C．even though
D．if
单项选择题
A．studiedB．researchedC．surveyedD．observed
A．studied
B．researched
C．surveyed
D．observed
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