题目内容

Kids are not allowed to leave kindergartens       their parents come to pick them up.
A．sinceB．unlessC．althoughD．because
B
连词辨析. Since由于,自从……以来；unless除非，如果不；although虽然，尽管；because因为；句意：如果他们的父母不来接他们，孩子们是不允许离开幼儿园的。结合语境可知选B。
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