题目列表(包括答案和解析)
This is an illness that can result in total blindness ________ left untreated.
A.if
B.after
C.since
D.because
This is an illness that can result in total blindness _________ left untreated.
A.after
B.if
C.since
D.unless
This is an illness that can result in total blindness ___________ left untreated.
[ ]
This is an illness that can result in total blindness ________ left untreated.
[ ]
陕西省长安一中2011届高三第五次质量检测英语
This is an illness that can result in total blindness ___ left untreated.
A. after B. if C. since D. unless
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