单项选择题

—I was pleased to hear the news. --So ______.

A．do I
B．am I
C．was I
D．did I
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单项选择题
It's very informal here, you ______ wear a tie unless you want to.
A．don't have to
B．must not
C．could not
D．may not
单项选择题
It is important for everyone ______ learn English.
A．by
B．when
C．to
D．how
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