It is essential that you________train tickets as early as possible before the Spring Festival.

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问题 It is essential that you________train tickets as early as possible before the Spring Festival.

选项 A、must book
B、will book
C、are booking
D、book

答案D

解析在“It is/was important/essential…+that从句”句型中，从句要用虚拟语气，即从句谓语动词用 “should+动词原形”的形式，should可以省略。根据主句中的essential(完全必要的)可知，从句谓语动词应用(should)book。故选D。

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