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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单项选择题
—I didn't do well in the last English test．How about you —______.
A．I'll do better next time
B．I like English．though
C．A lot better
D．Even worse
单项选择题
It's more than half a century ______ my grandfather joined the Party and became a servant to the people.
A. when
B. that
C. since
D. while
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