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Despite the development of a vaccine, measles______ still a serious danger to ad
Despite the development of a vaccine, measles______ still a serious danger to ad
游客
2023-11-20
31
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问题
Despite the development of a vaccine, measles______ still a serious danger to adult victims.
选项
A、is
B、are
C、has been
D、was
答案
A
解析
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