单项选择题


A．However
B．And
C．Therefore
D．So
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单项选择题
A．reasonB．causeC．problemD．purpose
A．reason
B．cause
C．problem
D．purpose
单项选择题
A) tries to cover C) falls to cover B) manages to cover D) succeeds in covering
A．tries to cover
B．manages to cover
C．falls to cover
D．succeeds in covering
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