We are grateful________ you ________ what you have done.A.for; toB.for; forC.to; toD.to; for
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D解析be grateful to sb. 意为“对某人表示感激”，be grateful for sth.表示“为某事而感谢某人”，这两个短语也可组合成be grateful to sb. for sth.，表示“为某事而感谢某人”，此含义也可通过下列几个短语体现：be thankful to sb.for sth.；thank sb. for sth.；give thanks to sb. for sth.。