问题
选择题
Nowadays school bus safety has drawn much attention nationwide for children's safety is _______
worries parents most. [ ]
A. why
B. which
C. that
D. what
答案
答案：D
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Nowadays school bus safety has drawn much attention nationwide for children's safety is _______
worries parents most. [ ]
A. why
B. which
C. that
D. what
答案：D