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【题目】The nurse won't leave her patients ______she's sure they are all taken good care of.

A. unless B. because C. so D. if

【答案】A

【解析】句意:那个护士如果不确定她的病人都被很好的照顾,她不会离开。unless除非;because因为;so所以;if如果。unless,if引导条件状语从句用一般现在时表示一般将来时,此处表示病人照顾不好,这个护士不离开,故选A。

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