单项选择题

A．moreover
B．otherwise
C．therefore
D．however
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单项选择题
A．assumeB．attainC．accomplishD．accumulate
A．assume
B．attain
C．accomplish
D．accumulate
单项选择题
A．refersB．appliesC．happensD．concerns
A．refers
B．applies
C．happens
D．concerns
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