单项选择题

We______her letter last week. We don't know what has happened to her.

A．must receive
B．must have received
C．ought to receive
D．ought to have received
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单项选择题
She ______ in the feet on her way home from work.
A．was hurting
B．is hurt
C．hurts
D．got hurt
单项选择题
On ______ of the school, I'd like to welcome you all.
A．behalf
B．dairy
C．decade
D．delight
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