The naughty boys would play trick on neighbours who didn’t give them any sweets on Halloween.
A. a; 不填
B. a: the
C. the; 不填
D. 不填; the
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A. a; 不填
(答案→)B. a: the
C. the; 不填
D. 不填; the
解析：本题考查冠词。play a trick on… 捉弄，为固定短语。Neighbours后有限制性定语修饰，是特指，前要加the。