题目内容
The word “so” in “I think so.” is a _________________.
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The expressions that is made up from the first letters of the names of an organization, such as “ WTO, BBC, EEC, UNESCO” are called___________.
“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 ___________.
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