问题

Children under 12 years of age in that country _____ be under adult supervision when in a public library. [ ]
A: must
B: may
C: can
D: need
B: may
C: can
D: need
正确答案是:
同类题型
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That paint is wet, you ___ touch it.
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___alone in thelarge house, the little boy had to learn to survive by himself
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