单项选择题

If he had left in time for the last bus, he ______ it.

A．shouldn't have missed
B．ought not have missed
C．mustn't have missed
D．couldn't have missed
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单项选择题
These students don't realize ______ to start and run a company upon graduation.
A．what takes them
B．what it takes
C．what they should take
D．what to take it
单项选择题
______ with enough instruments necessary for the experiment, these scientists are expecting to finish it ahead of time.
A．To be supplied
B．To supply
C．Supplying
D．Supplied
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