—Hi Bruce. Here is a letter for you.—Thanks. I wonder.A. who the letter was from B. who w

问题补充：

—Hi, Bruce. Here is a letter for you.

—Thanks. I wonder.

A. who the letter was from

B. who was from the letter

C. who was the letter from

D. who from the letter was

答案：

(答案→)A. who the letter was from

B. who was from the letter

C. who was the letter from

D. who from the letter was

解析：英语宾语从句中一般为陈述语序。句意：嗨，布鲁斯，这有你的一封信。——谢谢。我想知道这封信是来自谁的。短语be from来自。结合语境可知疑问词为宾语从句的逻辑宾语，选项BCD结构有误，故选A。