单项选择题

He was ______ in the bed because he caught a cold.

A．lieing
B．laying
C．lying
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单项选择题
I am busy ______ my homework these days after three day's away.
A．do
B．doing
C．in doing
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
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