单项选择题

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

A. if
B. after
C. since
D. because
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单项选择题
______ he will leave for Beijing.
A. It will not be long before
B. It is before long that
C. It is before long
D. It was before long that
单项选择题
We hadn't met for 20 years, but I recognized her ______ I saw her.
A. for the moment
B. the moment
C. the moment when
D. at the moment that
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