单项选择题

______ the practice, the best rule is the one that works.

A．As regards
B．As regard to
C．As regards with
D．In regard to
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单项选择题
One Sunday morning the local post office______ an important special delivery letter to my home, though it was addressed to me at my office.
A．delivered
B．presented
C．submitted
D．transferred
单项选择题
A convenient way is to set the food on a piece of aluminum oil, ______to the air for half an hour, and then cover it with a dish.
A．let it stay open
B．let it stay opened
C．letting it stay open
D．letting it stay opened
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