By the time the bell …, I … the test.
A. had rung/had finished
B. rang/was finished
C. rang/had finished
Select your answer:

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Maya has a big exam coming up, and she is trying to decide how to prepare.
Explain the nuance (=slight difference in meaning) of obligation between ‘must’ and ‘have to’ in her situation.
A. ‘Must’ conveys a stronger, personal obligation, while ‘have to’ indicates an obligation based on external circumstances.
B. ‘Must’ indicates a suggestion, while ‘have to’ is a command.
C. ‘Must’ is used for past obligations, while ‘have to’ is for future obligations.
D. ‘Must’ and ‘have to’ are interchangeable with no difference.
