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【题目】The nurse won't leave her patientsshe's sure they are all taken care of.
A.unless
B.because
C.since
D.if

【答案】A
【解析】句意:这个护士不会离开她的病人,除非她确定病人们都被照顾得很好。because因为,引导原因状语从句;since自从,引导时间状语从句;既然,引导原因状语从句;if如果,引导条件状语从句;unless除非,如果不,引导条件状语从句。根据句意可知,这里考查的是从属连词unless,故选A。

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