Scientists and doctors across the world have done _____ research over the years, hoping to find a cure for cancer.
A.a great deal of | B.quantity of |
C.quite a few | D.a large number of |
相关知识点
推荐套卷
Scientists and doctors across the world have done _____ research over the years, hoping to find a cure for cancer.
A.a great deal of | B.quantity of |
C.quite a few | D.a large number of |