单项选择题

He must have been very depressed when he heard the news,

A．mustn't he
B．haven't he
C．wasn't he
D．didn't he
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单项选择题
The increasing global warming will have a devastating effect on some coastal areas, or ________many scientists have warned.
A．so
B．it
C．thus
D．that
单项选择题
They hoped________them.
A．us to go and join
B．that we would go and join
C．for us to go and join
D．our going and joining
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