2. 外语
  3. Despite the development of a vaccine, measles______ still a serious danger to adult victims.

Despite the development of a vaccine, measles______ still a serious danger to adult victims.

admin2010-02-22  66
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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