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Thisisanillnessthatcanresultintotalblindnessif

問題詳情:

Thisisanillnessthatcanresultintotalblindnessif

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

A. being left              B. left               C. to be left            D. leaving

【回答】

B

知識點:倒裝與省略

題型:選擇題

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