The boy blue trousers .A. with, look coolB. in, looks coolC. with, looks coolD. in, look

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A. with, look cool
(答案→)B. in, looks cool
C. with, looks cool
D. in, look cool
解析：介词in+颜色或服饰表示穿什么衣服用来修饰the boy；look+形容词表示看起来怎样。