Re: 朗文advance - 自學

p.233
Reservation: reservations are required for all club, custom-class and
sleeping-car accommodations.
Reservations for coach travel are required on all trains designated as
"All-Reserved Trains."
Seating in trains with unreserved coach service is not guaranteed.

請教以上精準的翻譯，特別是黃色的部分

Q.181
Where are reservations NOT required?
(A) In all club cars
(B) In some coach cars
(C) In custom-class cars
(D) In sleeping cars

答案是B，可是從文章中哪一句可以直接看出答案呢？
只能說從第一句可以看出 club, custom-class and sleeping-car 都要訂位

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