That ___ be the solution to the problem. MCQ with Answer and Explanation

That ___ be the solution to the problem.

A. could

B. would

C. must

D. shall

Answer: Option A

'Could' possibility.

This question belongs to: English Modals

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Question #1 Report Error

___ I borrow your pen for a moment?

A. Could

B. Should

C. Must

D. Would

Correct Answer: Option A

Explanation:
'Could' is a polite request.

This question belongs to: English Modals

Question #2 Report Error

She ___ have forgotten my number; she never calls.

A. must

B. would

C. could

D. should

Correct Answer: Option A

Explanation:
'Must have' deduction.

This question belongs to: English Modals

Question #3 Report Error

He ___ have taken the wrong train; that's why he's late.

A. should

B. might

C. must

D. would

Correct Answer: Option B

Explanation:
'Might have' indicates past possibility.

This question belongs to: English Modals