Ithinkchildrenshouldtrytoworkout

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B解析分析：句意是“孩子应该尽力靠自己去解决问题”，主语是children，by是介词，介词后面的意思是指主语自己，所以用themselves．(延伸)by oneself有不同的意思：1)“靠自己”：He did it by himself．＝He did it without help．(“他是自己做这件事的”，强调是在没有别人帮助的情况下做的。因此He did it by himself．是意思和He did it himself．差不多但意思要更丰富一些的表达方式)2)“独自，没有别人”：The old man was sitting by himself in the room．＝The old man was sitting alone in the room．The boy was left by himself at home by his mother．＝The boy was left alone at home by his mother．