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

分析 --你去过美国多少次?
--只有一次.

解答 答案:D.考查疑问词组.how long多久,对一段时间或长度提问.how soon"多快/多久以后",其后用in加一段时间来回答.how often多久,对频率提问.how many times多少次,对次数提问.根据回答"只有一次",可知,对次数提问用how many times多少次.答案是D.

点评 疑问词组通常用来构成疑问句,要根据回答的具体内容进行选择,注意一些固定搭配,分清疑问词的用法.

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