【題目】The nurse won’t leave her patients ______ she’s sure somebody else takes good care of them.

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

【答案】D

【解析】

句意:這個護士如果不確定其他人照顧她的病人,她不會離開他們。if如果,引導條件狀語從句用一般現(xiàn)在時,主句用一般將來時;because因為,since自從,引導時間狀語從句,主句用現(xiàn)在完成時;unless除非,如果不,引導條件狀語從句用一般現(xiàn)在時,主句用一般將來時;結(jié)合句意,如果她不確定有人照顧病人,她不會離開。故選D。

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