2. 外语
  3. In its gaseous state, water______invisible vapor.

In its gaseous state, water______invisible vapor.

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问题 In its gaseous state, water______invisible vapor.
选项 A、is a
B、are
C、is the
D、is an
答案D
解析 Is an correctly completes the sentence. The uncountable noun water takes the singular verb is. The noun phrase invisible vapor is non-specific and begins with a vowel sound. Therefore, it takes the indefinite article an.
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