单项选择题

He didn't come yesterday. He ______ busy working in the lab.

A．must be
B．would have been
C．must have been
D．would be
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单项选择题
No sooner ______ than he realized that he should have remained silent.
A．the words had spoken
B．had the words spoken
C．the words had been spoken
D．had the words been spoken
单项选择题
It ______ that the mysterious visitor was an old friend of my grandmother.
A．turned up
B．turned off
C．turned on
D．turned out
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