单项选择题

A．tries to cover
B．falls to cover
C．manages to cover
D．succeeds in covering
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单项选择题
A．spreadB．passedC．printedD．completed
A．spread
B．passed
C．printed
D．completed
单项选择题
A．reasonB．causeC．problemD．purpose
A．reason
B．cause
C．problem
D．purpose
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