问题
选择题
He forgot to lock the door, _______of course, made things even worse.
A．who
B．whom
C．which
D．what
答案
答案：C
题目分析：句意：他忘记了锁门，当然这使得事情更糟。这里是非限制性定语从句，which引导非限制性定语从句，指代前面的句子，而且在从句中做主语，选C。
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