16.---______have you been to the USA?---Only once.( 。
A.How longB.How soonC.How oftenD.How many times

分析 --你去過美國多少次?
--只有一次.

解答 答案:D.考查疑問詞組.how long多久,對一段時間或長度提問.how soon"多快/多久以后",其后用in加一段時間來回答.how often多久,對頻率提問.how many times多少次,對次數(shù)提問.根據(jù)回答"只有一次",可知,對次數(shù)提問用how many times多少次.答案是D.

點評 疑問詞組通常用來構成疑問句,要根據(jù)回答的具體內容進行選擇,注意一些固定搭配,分清疑問詞的用法.

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