单项选择题

Now that she is sick with cold, I feel I ______ have stopped her from going out in the rain,

A．could
B．might
C．must
D．ought to
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单项选择题
The taxi was held up on the way to the railway station, otherwise I ______ the train.
A．must catch
B．have caught
C．could have caught
D．ought to catch
单项选择题
It is no ______ arguing about it, because he will never change his mind.
A．use
B．help
C．time
D．lively
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