【題目】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:這個(gè)護(hù)士不會(huì)離開她的病人,除非她確定病人們都被照顧得很好。because因?yàn)椋龑?dǎo)原因狀語從句;since自從,引導(dǎo)時(shí)間狀語從句;既然,引導(dǎo)原因狀語從句;if如果,引導(dǎo)條件狀語從句;unless除非,如果不,引導(dǎo)條件狀語從句。根據(jù)句意可知,這里考查的是從屬連詞unless,故選A。

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