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The letter he has been waiting ____ is from his former head

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The letter he has been waiting ____ is from his former head teacher.
A、for which B、for C、for it D、for whom
答案是A,为什么,这个介词 放哪里的啊
The letter he has been waiting ____ is from his former head
he has been waiting for the letter.which = the letter
for which引导了定语从句;而B中缺少关系代词的which,无法构成定语从句;C中的it不是关系代词;D中的关系代词whom表示人,而先行词的letter不是人,是事物