单项选择题

The mail I wrote to my mom was delivered this morning.

A．received
B．lost
C．sent
D．found
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单项选择题
The boy always looks through his homework before handing it in.
A．write
B．does
C．finishes
D．examines
单项选择题
It is obvious that it has been too late to take action.
A．true
B．certain
C．said
D．apparent
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