问题
选择题
His sister works ________ a magazine. She’s a reporter.[ ]
A. in
B. for
C. at
D. to
答案
答案：B
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His sister works ________ a magazine. She’s a reporter.[ ]
A. in
B. for
C. at
D. to
答案：B
为有限值，则k=（），此时，
（）。