We were all to receive your letter and had read it delight.
A. delight, in
B. delighting, in
C. delighting, with
D. delighted, with
网友回答
A. delight, in
B. delighting, in
C. delighting, with
(答案→)D. delighted, with
解析：考查固定词组。Be delighted to do sth做某事很高兴；with delight高兴地；句意：收到你的来信我们都很高兴，并且都很高兴地阅读了你的信。故D正确。