问题
选择题
The reason _______ he was late again was that he was caught in a traffic jam.
A．which
B．in which
C．for which
D．of which
答案
答案：C
题目分析：句意：他再次迟到的原因是他被困在了交通堵塞中。通过分析句子结构，可知这个句子中包含一个定语从句，表示原因，用介词for，选C。
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