单项选择题

—Can you come here again next Sunday evening
—Sorry, I ______.

[A] can’t
B. may not
C. mustn’t
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单项选择题
Some people think that CD-ROMs will soon be______books.
[A] as more popular as
B. as popular than
C. more popular than
单项选择题
______, I didn’t know how to use the machine.
[A] At beginning
B. At first
C. At start
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