单项选择题

I was so familiar with her that I recognized her voice ______ I picked up the phone.

A. the moment
B. after
C. before
D. while
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I had no sooner got back to the kitchen ______ the door-bell rang loud enough to wake the dead.
A. when
B. than
C. as
D. while
单项选择题
Information technology is taught in most schools，______ we have entered the information society.
A. so
B. while
C. still
D. for
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