问题补充：
Fifteen-year-olds to have jobs in China.
A. is not allowed
B. are allowed
C. is allowed
D. are not allowed
答案：
A. is not allowed
B. are allowed
C. is allowed
(答案→)D. are not allowed
解析：句意：在中国十五岁的青少年不允许参加工作。be allowed （not）to do sth意为“被允许（不）做某事”，故选D。
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