2. 外语
  3. New volcanoes may appear ______ people do not expect them to be.

New volcanoes may appear ______ people do not expect them to be.

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问题 New volcanoes may appear ______ people do not expect them to be.
选项 A、whenever and wherever
B、when and where
C、whatever and wherever
D、in when and where
答案A
解析 whenever=at any time when; wherever=in any place where，选项B中的when和where只能作关系副词，不能既作关系副词，又作appear的状语。注意：凡是加了-ever的疑问词都有名词和关系代词或副词的功能，如：whoever=anybody who; whatever=anything which (that)。
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