-shall we have our picnic tomorrow?-______ it diesn't matter.A.Until B.While C.Once D.If为什么不选C.

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-shall we have our picnic tomorrow?-______ it diesn't matter.A.Until B.While C.Once D.If为什么不选C.
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-shall we have our picnic tomorrow?-______ it diesn't matter.A.Until B.While C.Once D.If为什么不选C.
-shall we have our picnic tomorrow?-______ it diesn't matter.A.Until B.While C.Once D.If
为什么不选C.

-shall we have our picnic tomorrow?-______ it diesn't matter.A.Until B.While C.Once D.If为什么不选C.
句子的意思:-我们明天去野餐好吗?-如果没什么事的话.填的是表示条件的.
once 可引导条件从句,做“一旦”“一经”解,例:Once you begin,you must continue.(一旦开始,你就必须继续下去.)显然与条件不符.

once 也可用于引导条件状语从句
但通常只放在句首