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
______, the speaker interrupted his lecture.
A．His voice was drowned by the noise
B．His voice being drowned by the noise
C．Drowned by the noise
D．His voice drowned by the noise
单项选择题
You are welcome to stay with us ______ you share the rent.
A．as soon as
B．as long as
C．as much as
D．as well as
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