The letter he had been looking forward to________at last this morning.A.eB.esC.ingD.came
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D解析这题考查谓语动词的用法：是个易错题，容易选成C，look forward to “盼望”其中to是介词，以为是动名词做宾语，但这题look forward to的宾语是theletter，he had been looking forward to是定语从句，这句话缺少谓语，填came。句意是：他一直盼望的信终于来了。选D。