单项选择题

A．employed
B．created
C．operated
D．controlled
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单项选择题
A．cameB．arrivedC．gotD．appeared
A．came
B．arrived
C．got
D．appeared
单项选择题
A．usefulB．effectiveC．helpfulD．creative
A．useful
B．effective
C．helpful
D．creative
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