問題詳情

15. ( )Learning is happy. It’s ______ fun, not _____ grades.
(A) on; for 
(B) at; at 
(C) for; for 
(D) in; on

參考答案

答案:C
難度:非常困難0
統計:A(0),B(0),C(0),D(1),E(0)