单项选择题


A．away
B．off
C．inside
D．within
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单项选择题
A．from time to timeB．in timeC．sooner or laterD．on occasion
A．from time to time
B．in time
C．sooner or later
D．on occasion
单项选择题
Canning (is) the (most wide) used (method) of food (preservation).
A．is
B．most wide
C．method
D．preservation
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