问题补充：
She writes from time to time.
A. him to letters
B. a letter him
C. him a letter
D. letter to him
答案：
A. him to letters
B. a letter him
(答案→)C. him a letter
D. letter to him
解析：有些及物动词可以接两个宾语，一指人，另一指物，若把直接宾语（人）前置，要在间接宾语（物）前加上to, for或of
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