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

游客2023-11-20 51

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:http://tihaiku.com/zcyy/3203904.html

相关试题推荐

随机试题

最新回复(0)

Ourcountryistryingto______theseriousproblemscreatedbytheenvironment