could it be in the valley in(which)we had a picnic(that)you left behind your keys and wallet

could it be in the valley in(which)we had a picnic(that)you left behind your keys and wallet

题目
could it be in the valley in(which)we had a picnic(that)you left behind your keys and wallet
为什么后面一空要认为是强调句来理解呢?为什么不能用where
答案
举一反三
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