He _________ desperately in vain for something to say to break the silence.A.thought aboutB.cast aboutC.talked aboutD.set about
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B解析试题分析：选项A“想到”； 选项B“想法设法”； 选项C“谈论”； 选项D“着手，开始做”。 cast about for sth“试图找到某物” 。句意：他拼命地想找到某些话题来打破沉默。考点：考查固定短语的意义
点评：固定短语是近几年高考热点，尤其是动词短语，需要考生平时多积累。即学即练：He _________learning Chinese at age ten.A. thought about B. cast about C. talked about D. set about解析：D set about + doing句意：他在十岁时开始学中文。