A convenient way is to set the food on a piece of aluminum oil,______to the air

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问题 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.

选项 A、let it stay open
B、let it stay opened
C、letting it stay open
D、letting it stay opened

答案 C

解析语法类试题。分词做伴随情况状语，形容词open在短语中作补语，表示状态，不用过去分词。所以D不正确。

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