The aging population _____ each day .There must be some kind of interesting activity for the old.
#105312
A
has grown
B
grew
C
will grow
D
is growing
推荐题目
7.Although the causes of cancer ____, we do not yet have any practical way to prevent it.  
#105343
A
are being uncovered
B
have been uncovering
C
are uncovering
D
have uncovered
New medicines and instruments ______ every day to extend life.
#105334
A
develop
B
are being developed
C
are developing
D
have developed