单项选择题

You are his best friend, so I' d rather that you ______ him of the risk than I ______.

A．warn... do
B．warned... did
C．warned... do
D．warn... did
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单项选择题
The two thieves took it for granted that the whole ______ was out because it was silent in the whole house.
A．household
B．inherits
C．dwellers
D．inhabitants
单项选择题
They ______ because the light's on!
A．must have gone out
B．can't have gone out
C．mustn't have gone out
D．can't go out
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