can/could (1) How _______ you be merciless.
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could is the answer
Answer:
Sentence=How ------------------ you be so merciless?
Here both the options are correct. 'Could' shows that this has been asked after the act has been done.
'Can' shows the present.
So, both the options are correct but in this context, I think 'can' would be much more suitable.
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