I ( )my wallet when I was shopping in the store.答案为什么选择must have dropped而不是ought to have dropped?

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I ( )my wallet when I was shopping in the store.答案为什么选择must have dropped而不是ought to have dropped?
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I ( )my wallet when I was shopping in the store.答案为什么选择must have dropped而不是ought to have dropped?
I ( )my wallet when I was shopping in the store.
答案为什么选择must have dropped而不是ought to have dropped?

I ( )my wallet when I was shopping in the store.答案为什么选择must have dropped而不是ought to have dropped?
must do 和 ought to do都表示"应该做"
但是must还有个功能:表肯定的猜测.
这里就是指 我在那商店购物的时候肯定把钱包给丢了.表猜测,用must
ought to 没这个功能.

这里用must have dropped时表示对过去发生的事情的一种肯定性的推断,准确率比较高的那种
而ought to have dropped可能性较低