单项选择题

"How was （） they discovered the entrance to the underground palace Totally by chance. "

A. it that
B. he that
C. it when
D. he which

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

A．plans
B．planning
C．planned
D．to plan
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