2. 外语
  3. —This ruler is three times as long as that one. It is not______ to discuss the question again and again.

—This ruler is three times as long as that one. It is not______ to discuss the question again and again.

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问题 —This ruler is three times as long as that one.     It is not______ to discuss the question again and again.
选项 A、worth
B、worthy
C、worthwhile
D、worth while
答案C
解析 worth，worthy和worthwhile均为形容词，意为“值得的”，但三者用法不同：worth后跟名词或动名词；而worthy常与of连用，构成be worthy of，of的后面接名词或动名词的被动形式。worth只作表语，worthy既可作表语，也可作定语，worthwhile也是可用作表语或定语。worthwhile常用结构为be worthwhile to do sth分析句子的结构可知，答案为C。
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