Cats ______ afraid of dogs, but my Kitty always chases my neighbor’s dog.

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问题 Cats ______ afraid of dogs, but my Kitty always chases my neighbor’s dog.

选项 A、supposed to
B、are supposed to be
C、be supposed to

答案B

解析 be supposed to 表示“应该做……”,与should 意思相近。词组 be afraid of 的意思是“担心”,因此正确答案是[B]。
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