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
Only 11 people ______ the shipwreck.
A．survived after
B．survived through
C．were survived
D．survived
单项选择题
When she was busy tidying the room, her little kid is always ______.
A．under way
B．on the way
C．in the way
D．by the way
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