2. 外语
  3. Railways are ______ to the economic prosperity of the country.

Railways are ______ to the economic prosperity of the country.

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问题 Railways are ______ to the economic prosperity of the country.
选项 A、essential
B、useful
C、reliable
D、preferable
答案A
解析 essential(to)a.(定语或表语)必要的，必不可少的，非常重要的。
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