摘要： must→ should
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——Must I park my car behind the building?
——No, you needn’t. You _____ park it here.
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——No, you needn’t. You _____ park it here.
| A．need | B．must | C．may | D．should |
---Must I work out the problem right now?
---Yes, you _______. It’s very serious.
| A．can | B．must | C．may | D．should |
—Must I pay for the bill now, boss?
—No, you __________ pay for it after the meal.
| A．needn’t | B．can’t | C．may | D．should |