I’m pleased to receive your letter of April 10th,______for our catalogue and price-list.

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问题 I’m pleased to receive your letter of April 10th,______for our catalogue and price-list.

选项 A、ask
B、asked
C、to ask
D、asking

答案D

解析 本题考查非谓语动词。分析句子结构可知,动词ask的逻辑主语是letter,letter和ask之间是主动关系,因此应该使用现在分词形式,即asking,故本题答案为D)。
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