单项选择题

He had a bad cold. _______ is why he didn't come.

A．It
B．This
C．That
D．What
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单项选择题
He _______ so much work that he couldn't really do it efficiently.
A．put on
B．turned on
C．brought on
D．took on
单项选择题
The prisoner has been _______ of many privileges that average citizens enjoy.
A．ensured
B．informed
C．deprived
D．convinced
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