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
_______ has recently been done to provide more flats for the propel, the housing problem in this city is still very serious
A．What
B．That
C．As a matter of fact
D．In spite of what
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
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