问题补充：
It was because I was caught in the traffic jam I came to school late this morning.
A. which
B. when
C. what
D. that
答案：
A. which
B. when
C. what
(答案→)D. that
解析：本题考查强调句。这是一个强调句型It is ……that………结构，强调原因状语，故选D。句意：今天早上我来学习迟到是因为我陷于交通阻塞。
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