单项选择题


A．rough
B．difficult
C．easy
D．entertaining
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单项选择题
A．wentB．putC．tookD．caught
A．went
B．put
C．took
D．caught
单项选择题
A．inventingB．inventedC．to inventD．being invented
A．inventing
B．invented
C．to invent
D．being invented
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