Question

I think I ______ have failed the test, but i'm not sure.
A. ought to B. might C. shall D. can​

Answer 1

I think I might have failed the test, but I'm not sure.

Step-by-step explanation:

These verbs are known as modals. Each expresses one of the following;

- Ability: can and could.

- Permission: can and may.

- Likelihood: will, might, may, can, and could.

- Obligation: must and have to.

- Advice: should.

Answer 2

B) I think I might have failed the test, but i'm not sure.

Step-by-step explanation:

Hope it helps! =D