---Sorry, Professor Smith. I didn’t finish the assignment yesterday.
---Oh, you___________ have done it as yesterday was the deadline.
| A．must | B．mustn’t | C．should | D．shouldn’t |
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---Sorry, Professor Smith. I didn’t finish the assignment yesterday.
---Oh, you___________ have done it as yesterday was the deadline.
| A．must | B．mustn’t | C．should | D．shouldn’t |
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