阿摩線上測驗
19. A biologist does not merely describe organisms, but tries to learn ____ act as they do.
(A) what causes them to
(B) what cause to them
(C) causes them to what
(D) causes what they to
答案：登入後查看
統計： A(146), B(44), C(5), D(8), E(0) #2406759
統計： A(146), B(44), C(5), D(8), E(0) #2406759
