问题
选择题
If a bag is filled with books and pens, it must belong to someone _________ works hard. [ ]
A. which
B. /
C. whom
D. who
答案
答案：D
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If a bag is filled with books and pens, it must belong to someone _________ works hard. [ ]
A. which
B. /
C. whom
D. who
答案：D