Question

Complete the sentence with a suitable verb:

I left my bike outside the house last night but this morning it wasn't there anymore. Somebody __________ it.

• A. will have stolen
• B. can have stolen
• C. must have stolen
• D. could have stolen

Answer 1

The correct option is C must have stolen

'Will' indicates promise / voluntary action.

'Must' indicates compulsion / surety.

'Could' indicates ability in the past / possibility.

'Can' indicates ability / capacity / permission.

Here, it is implied that the bike is sure to have been stolen.

Therefore, the correct option is: must have stolen.