问题
选择题
It is easy to set the goal of our production for next year, but to achieve it takes a lot of trouble.[ ]
A. how
B. who
C. where
D. when
答案
答案：A
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It is easy to set the goal of our production for next year, but to achieve it takes a lot of trouble.[ ]
A. how
B. who
C. where
D. when
答案：A