---Your brother is very careful and honest．---I agree．What he has just done ________ itself．A.speaks outB.thinks ofC.speaks forD.thinks out
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C解析考查短语动词．speak out意为“大声且清楚地说出”；speak for意为“代替……讲话；(事情)显示(某人的优点等)”；think of意为“认为……；想到……”；think out意为“想出(计划等)；想透(问题等)”．故选C．