It's necessary that measures _____ at on
题型：选择题
问题：
It's necessary that measures _____ at once to help people understand global warming is
affecting our life to an increasingly high degree.
A．must be taken
B．be taken
C．should take
D．are taken
It's necessary that measures _____ at once to help people understand global warming is
affecting our life to an increasingly high degree.
A．must be taken
B．be taken
C．should take
D．are taken