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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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