单项选择题

He ______ the 8:25 train because he didn't leave home till 8:30.

A．couldn't have caught
B．ought to have caught
C．shouldn't have caught
D．mustn't have caught
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单项选择题
I have no objection ______ his staying in the classroom as long as he keeps quiet.
A．of
B．to
C．in
D．over
单项选择题
How can I ever concentrate if you ______ continually ______ me with foolish questions
A．have ... interrupted
B．had ... interrupted
C．are ... interrupting
D．were ... interrupting
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