单项选择题

The whole building ______ burned down. But the heavy rain ______.

A．might have been; had helped
B．could have been; helped
C．was; could help
D．must have been; help
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单项选择题
Our ancestors celebrated ______ birth of ______ child by giving away red eggs.
A．the; a
B．the; the
C．不填; a
D．不填; the
单项选择题
It's really time I went home but I'm enjoying myself, so I here a bit longer.
A．am staying
B．have stayed
C．stayed
D．stay
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