单项选择题

In the Middle West, frost may appear in_______________.

A．late spring
B．early spring
C．late summer
D．early autumn
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单项选择题
Most of corn and wheat is______________.
A．sold to feed people
B．exported to foreign countries
C．sold to fatten cattle and pigs
D．sold as food
单项选择题
I do not remember ________________ this book before.
A．reading
B．having ever read
C．to have ever read
D．to read
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