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单选题 英语语法（00831）
Both air and water ______ what most creatures cannot live without.
A is
B are 正确答案
C was
D were
正确答案：B
详细解析
are - 复数形式，与主语“Both air and water”的复数性质相符，且时态（一般现在时）正确。
所属课程：英语语法 考试类型：成人自考

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