单项选择题

A．tries to cover
B．manages to cover
C．fails to cover
D．succeeds in covering
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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．entertainB．encourageC．educateD．edit
A．entertain
B．encourage
C．educate
D．edit
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