未分类题

The word 'indispensable' in the first line means ______.
A.impossible
B.essential
C.advisable
D.available

A.A.impossible
B.essential
C.advisable

【参考答案】

B
解析：indispensable：(通常后接介词to)必不可少的，必需的。例如：Oxygen is indi......

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