问题补充：
caused the accident is still a complete mystery.
A. What
B. That
C. How
D. Where
答案：
(答案→)A. What
B. That
C. How
D. Where
解析：此题考查what引导名词性从句作主语。
1200字范文，内容丰富有趣，写作的好帮手！
时间：2022-10-30 23:34:31
caused the accident is still a complete mystery.
A. What
B. That
C. How
D. Where
(答案→)A. What
B. That
C. How
D. Where
解析：此题考查what引导名词性从句作主语。
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