单项选择题

I am busy ______ my homework these days after three day's away.

A．do
B．doing
C．in doing
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单项选择题
My sister is very interested in singing, and ______.
A．so is my brother
B．so am I, too
C．he is so
单项选择题
—Have you ever heard of Hemingway —Yes, of course, the book The Old Man and the Sea ______ by him.
A．is written
B．wrote
C．written
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