【题目】This was returned because the person ________ this letter was addressed had died three years ago.
A. to whomB. to which
C. whichD. whom
在线课程【答案】A
【解析】
考查介词+关系代词。句意：这封信被退回来是因为收信人三年前去世了。分析句子可知，the person为先行词，在后面的定语从句中，作介词的宾语，而定语从句中涉及be address to sb“给……写信”。所以介词为to。故A选项正确。