Fill in the blank using the appropriate option:
'You look tired.' 'Yes, I ____________ last night.'

can't sleep

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can sleep

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couldn't sleep

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could sleep

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Solution

The correct option is C couldn't sleep
'Can' indicates ability / capacity.
'Could' is used as the past tense of 'can'.
'Can't' indicates present incapability.
'Couldn't' indicates past incapacity / inability.
Here, the speaker is talking about the past and his/her inability to sleep. Therefore, the correct option is C: couldn't sleep.

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