单项选择题

The room is in a terrible mess; it ______ cleaned.

A．can't have been
B．mustn't have been
C．shouldn't have been
D．wouldn't have been
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单项选择题
The manger lost his ______ just because his secretary was ten minutes late.
A．mood
B．temper
C．mind
D．passion
单项选择题
______ it or not, his discovery has created a stir in scientific circles.
A．Believe
B．To believe
C．Believing
D．Believed
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