单项选择题

It's quite early. We ______ worry about the time.

A． mustn't
B． may not
C． needn't
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单项选择题
He felt ______ when he heard the bad news.
A． happy
B． pleased
C． sad
单项选择题
Mary likes playing ______ piano while David is interested in listening to ______ music.
A． the, the
B． the, /
C． /, the
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