自制果酒的制作方法:_____ his fifth year, he invented a new machine.
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A. At B. On C. For D. In
D
D
在他15岁那年,他发明了一种新机器 .
D
in his fifth year在他5岁那年
in the fifth year of marriage在结婚的第五年
D
A
我选A,在指年龄时用at,没错的
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