When you open and drink an orange juice, it is essential that it_______ first.

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问题 When you open and drink an orange juice, it is essential that it_______ first.

选项 A、shake
B、shaking
C、shaken
D、be shaken

答案D

解析 essential和necessary、important一样都是理性判断时用的形容词。这里的that从句里省略了should，所以应填入动词原形。在A选项和D选项之中，应选择被动语态的D选项。

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