we are thinking of __ we should go for a picnic.(if,whether)填什么,原因

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we are thinking of __ we should go for a picnic.(if,whether)填什么,原因
we are thinking of __ we should go for a picnic.(if,whether)
填什么,原因

we are thinking of __ we should go for a picnic.(if,whether)填什么,原因
whether

whether------------是否

whether 引导宾语从句,在介词后只能用whether .