题目内容：
It is impolite you to ring off when others haven’t finished their talking on the phone.A．forB．fromC．toD．of
参考答案：
单选题：It is impolite you to ring off when others haven’t finished..
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____time,Chinese farmers have invented many farming techniqu..
____time,Chinese farmers have invented many farming techniques.A．OverB．InC．OnD．For
Margie shows a very positive attitude ____ her work.A．withB..
Margie shows a very positive attitude ____ her work.A．withB．toC．ofD．about
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Japan lies_____ the east of China ______the east of Asia.A．in; onB．to; inC．on; toD．to; on
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Rock’n’roll was Black music that broke through to white culture when whites played the Blacks’ songs _______ the same style.A．withB．onC．inD．by