单项选择题


A．Air pollution
B．Water pollution
C．Some diseases
D．All farm land
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单项选择题
If you keep on, you' ll succeed ______.
A．in time
B．at one time
C．at the same time
D．on time
单项选择题
— ______ the sports meet might be put off.—Yes. It all depends on the weather.
A．I've been told
B．I've told
C．I'm told
D．I told
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