问题
选择题
I’m sorry not to have replied to your letter earlier, ______, I must say , I apologize.
A．which
B．for which
C．to which
D．whom
答案
答案：B
考察定语从句。Which指代前面一句话的内容在句中作为for的宾语。Apologize是不及物动词，后面不要直接加宾语。
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