单项选择题

John, how lazy you are! This work _____three days ago.

A．should have done
B．must have been done
C．should have been done
D． might have done
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单项选择题
_______I got home______ that I had the wrong umbrella.
A． Not until; did I notice
B．No sooner; than I noticed
C．Scarcely; did I notice
D．Only when; I noticed
单项选择题
The library _____, so it won't be available for students.
A．has been repaired
B． being repaired
C．is being repaired
D．has not repa
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