单项选择题

About ______ of these rooms ______ empty.

A. two third, are
B. two thirds, are
C. two thirds, is
D. two third, is
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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
单项选择题
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
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