问题
The research lacks ________ evidence, and therefore, its conclusions are doubtful.[ ]
A: solid
B: fierce
C: severe
D: potential
B: fierce
C: severe
D: potential
正确答案是：
同类题型
Where does he live now — In _______ is now part of the Economic Development Zone.
________ people________ walking along the beach.
Susan, go and join your sister cleaning the yard.—Why ____ John is sitting there doing nothing.
This method must be effective ,for I’veseen it ____ jobs by many different people.