This is an illness that can result in total blindness _____ left untreated.

A. after
B. if
C. since
D. unless
B
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This is an illness that can result in total blindness ____ left untreated.

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科目:高中英語 來源:0107 模擬題 題型:單選題

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This is an illness that can result in total blindness ____left untreated.

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This is an illness that can result in total blindness ____left untreated.

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This is an illness that can result in total blindness ____ left untreated.

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科目:高中英語 來源: 題型:014

This is an illness that can result in total blindness ________ left untreated.

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科目:高中英語 來源:英語教研室 題型:014

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