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【参考答案】

in改为on。
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单项选择题
A．The concert was bad.B．The concert was excellent.C．He didn’t go to the concert.D．He’ d like to enjoy it again.
A．The concert was bad.
B．The concert was excellent.
C．He didn’t go to the concert.
D．He’ d like to enjoy it again.
单项选择题
A．There was a shortage of workers on American farms.B．The most important of the early inventions was the iron plow.C．After 1869, many people devoted their attention to the plow.D．Charles Newbold had made a fortune by his cast-iron plow.
A．There was a shortage of workers on American farms.
B．The most important of the early inventions was the iron plow.
C．After 1869, many people devoted their attention to the plow.
D．Charles Newbold had made a fortune by his cast-iron plow.
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