单项选择题

Since the road is wet this morning, ______ last night.

A．it must rain
B．it has rained
C．it must have rained
D．it must have been rained
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单项选择题
Jean could be a very attractive girl but she ______ to her clothes.
A．pays no attention
B．was paying no attention
C．paid no attention
D．had paid no attention
单项选择题
The manager wants to know if they ______ our letter yet.
A．will answer
B．answered
C．have answered
D．had answered
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