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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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
单项选择题
______ the stockbrokers said the market was healthy, they refused to invest more money.
A． Because
B． Although
C． In addition
D． So
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