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
-- There isn't any bread left.--Oh, ______ I'll buy some in the supermarket. I'm going there in a few minutes.
A．is there
B．isn't it
C．isn't there
D．is it
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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