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解析：选C.此处为“be of＋抽象名词”句型.句意：你会发现当你在伦敦旅游时这张地图大有用处.A、B两项不合句意, D项为不可数名词,意为“重要性”;value为抽象名词,意为“用处,价值”. 2．The little boy was allowed to go swimming________he kept near the other boys. A．provided that B．in case C．now that D．by the time 解析：选A.考查连接词.句意：如果有别的男孩子在身边,这个小男孩是可以游泳的.provided that“如果”;in case“以防”;now that“既然”;by the time“到……时间为止”. 3．The girl,who was reported________by a wolf,was found in the forest. A．to be killed B．having killed C．to have been killed D．to be killing 解析：选C.句意：那个据报道已经被狼杀死的小女孩,在森林中被找到了.be reported后接不定式,表示“据报道……”.kill与the girl之间为动宾关系,故选择被动语态;kill动作发生在found之前,故用完成时. 4．(2017·福州模拟)Elephants have their own way to tell the shape of an object,________it is rough or smooth. A．不填 B．whether C．how D．what 解析：选B.句意：大象有自己的办法来辨别物体的形状,不管这个物体是粗糙的还是光滑的.whether...or...引导让步状语从句,故选B. | 
