2. 外语
  3. Railway is to a country ______ blood vessel is to a man’s body.

Railway is to a country ______ blood vessel is to a man’s body.

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问题 Railway is to a country ______ blood vessel is to a man’s body.
选项 A、what
B、as
C、that
D、like
答案A
解析 语法结构。what可以作为一个关系代词，表示“就像……一样”．用于句型X is to Y whatX1 is to Y1，表示“X之于Y正如X1之于Y1”，因此答案为A。
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