单项选择题

Production went down______ morale was low.

A． even though
B． when
C． but
D． to
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单项选择题
The seminar will adjourn ______ five o'clock.
A． in
B． on
C． at
D． the
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
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