---Peter ,please be quick.I "ll be late for the party.---People ____ fasten the seat belt or they"ll be fined.You must do it first.A.may B.can C.dare D.must请详解.

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---Peter ,please be quick.I "ll be late for the party.---People ____ fasten the seat belt or they"ll be fined.You must do it first.A.may B.can C.dare D.must请详解.
---Peter ,please be quick.I "ll be late for the party.
---People ____ fasten the seat belt or they"ll be fined.You must do it first.
A.may B.can C.dare D.must
请详解.

---Peter ,please be quick.I "ll be late for the party.---People ____ fasten the seat belt or they"ll be fined.You must do it first.A.may B.can C.dare D.must请详解.
D 涉及生命问题必须用must加强语气

D.此题考情态动词,C不对。A.B两个同时出现肯定不能选。。。所以就是D了