二、文法測驗【請在下列各題中選出最適當的答案】
9. You _____ clean your teeth twice a day to avoid tooth cavity or other problems.
(A)rather
(B) do
(C) had better
(D) have better

答案：登入後查看
統計： A(0), B(0), C(7), D(2), E(0) #3812976