Despite the development of a vaccine, measles______ still a serious danger to ad

游客2023-11-20  18

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
转载请注明原文地址:https://tihaiku.com/zcyy/3203904.html
最新回复(0)