問題詳情

21. Alan is a good son ___________　　　　 home, and he is agreat student 　___________　　　 school, too.
(A) in; at
(B) at; at
(C) in; in
(D) at; on

參考答案

答案：B
難度：適中0.5
統計：A(2),B(3),C(1),D(0),E(0)