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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单项选择题
In learning a foreign language, ______English, one should first pay attention to speaking, which is the groundwork of reading and writing.
A．says
B．say
C．to say
D．saying
单项选择题
The Wall Street multimillionaires are looking for new markets overseas where they can______ their surplus goods.
A．damp
B．deliver
C．dump
D．stamp
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