题目内容
The expressions that is made up from the first letters of the names of an organization, such as “ WTO, BBC, EEC, UNESCO” are called___________.
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“Motel” is a(n) __________________.
The words “make” and “bus” are called _________because they can occur unattached.
Words like “open”, “opens”, “opened” and “opening” share the same ___________.
The process by which “edit” is formed by taking away the suffix of “editor” is known as _______________.
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