The research lacks  evidence, and therefore, its conclusions are doubtful.
#19032
A
solid
B
fierce
C
severe
D
potential
推荐题目
He is a ______ traveller.
#20296
A
addictive
B
addicted
C
addition
D
additional
Her __________ wealth is in fact a very small sum.
#17610
A
supposing
B
supposed
C
to suppose
D
suppose