单项选择题

This is one of the most ______ ways of reducing pollution.

A．effective
B．efficiency
C．effect
D．efficient
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单项选择题
Could you tell me ______
A．who is that girl
B．that girl is who
C．who that girl is
D．whom is that girl
单项选择题
Will your father be on ______ on Christmas Day
A．duty
B．responsibility
C．job
D．task
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