单项选择题

Mark Twain usually forgot something because he ______.

A．was ill
B．was very busy
C．couldn’t remember anything
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单项选择题
The sheep was very ______.
A．kind
B．silly (傻的)
C．helpful
单项选择题
Why did the fox fall into the fiver
A．Because he was taking a walk.
B．Because he wanted to drink some water.
C．Because it was too dark.
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