单项选择题

Why is the woman busy these days

[A] Because she’s writing a book.[B] Became she’s learning how to use a computer.[C] Because she’s making computers.
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单项选择题
A． in B． at C． with
A． in
B． at
C． with
单项选择题
How long has Mr. Wang been here
A． He arrived here three hours ago.
B． He’s been here for an hour.
C． He came here half a hour ago.
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