2. 外语
  3. Children begin to communicate by making noises ______ they are able to speak a language.

Children begin to communicate by making noises ______ they are able to speak a language.

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问题 Children begin to communicate by making noises ______ they are able to speak a language.
选项 A、before long
B、long before
C、long ago
D、long after
答案A
解析 本题考查与long构成的副词短语。before long不久；long before在很久之前；long ago老早；long after很久之后。这句话的意思是：幼儿开始时通过发出声音与人交际，不需多久就会说话了。因而A项be fore long符合句意。
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大学英语四级

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