单项选择题
He ______ to your home, for he doesn't know your address.
A．can't have been
B．mustn't have been
C．shouldn't have been
D．needn't have been
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单项选择题
It is not considered ______ to litter in public.
A．respectful
B．respective
C．respected
D．respectable
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单项选择题
I thought his speech would be interesting, but it turned out that the more he talked, ______.
A．the more bored became I
B．the more I became bored
C．the more bored I became
D．I became the more bored
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