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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