单项选择题

The seminar will adjourn ______ five o'clock.

A． in
B． on
C． at
D． the
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单项选择题
______ Mrs. Lee was calling her husband's office, he was calling hers.
A． While
B． Because
C． So
D． Then
单项选择题
If banks ______ the number of credit cards, the economy would improve.
A． limiting
B． limited
C． had limited
D． are limiting
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