how _____ she do that to us!
i) may
ii) must
ii) could
iv) shall
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How (iii)could she do that to us!
- Could is basically a modal verb that is used to express possibility, past ability, and to make suggestions and requests.
- Here to express the exclamation with to express the past ability the word "Could" is used. That actually means that the speaker can not even believe that "she" has done "that" with them because she does not have any past ability like that.
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