单项选择题

This mathematic problem was so difficult that no student and no teacher ______ able to solve it.

A．were
B．is
C．was
D．are
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单项选择题
I can't drink______.
A．as sweet coffee as this
B．sweet coffee as this
C．as sweet as this coffee
D．the coffee as sweet as this
单项选择题
Jack would have been a top student in his school at the time, but he ______ hard enough.
A．hadn't worked
B．should work
C．didn't work
D．won't work
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