问题
选择题
__________ caused the accident is still a complete mystery.
A．What
B．That
C．How
D．Where
答案
A
此题考查what引导名词性从句作主语。
搜题请搜索小程序“爱下问搜题”
__________ caused the accident is still a complete mystery.
A．What
B．That
C．How
D．Where
A
此题考查what引导名词性从句作主语。