Teenagers should by all means ________ their studies though there are a lot of attractions around them．A.devote toB.fix onC.concentrate onD.keep on
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C解析句意：孩子们应当尽力专心于学习，尽管身边有许多吸引人的东西。devote to要用devote their attention to; fix on要改为fix their attention on; keep on后面不接名词，但可接动名词，表示“持续做某事”。