I ___ finish this puzzle; it's too hard. MCQ with Answer and Explanation

I ___ finish this puzzle; it's too hard.

A. can't

B. mustn't

C. shouldn't

D. may not

Answer: Option A

'Can't' for inability.

This question belongs to: English Modals

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Question #1 Report Error

You ___ not enter the room without knocking.

A. can

B. may

C. need

D. must

Correct Answer: Option D

Explanation:
'Must not' etiquette.

This question belongs to: English Modals

Question #2 Report Error

You ___ not disturb the library silence.

A. must

B. need

C. can

D. may

Correct Answer: Option A

Explanation:
'Must not' library rule.

This question belongs to: English Modals

Question #3 Report Error

He ___ have been sleeping when the doorbell rang.

A. could

B. must

C. would

D. should

Correct Answer: Option B

Explanation:
'Must have' deduction about past state.

This question belongs to: English Modals