单项选择题

This is an illness that can result in total blindness if （）．

A．to leave untreating
B．left untreated
C．1eaving untreating
D．is left untreated

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—How are you geeing on with your work —Oh，I’m sorry．Things aren’t going so well as （）．

A．plans
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C．planned
D．to plan
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Water, （） enough, can change into vapour quickly.

A. when heated
B. heating
C. though to be heated
D. when is heated
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