問題詳情

【題組】36.()I’ve been busy ______ the project for several months.
(A)to work for
(B)to work on
(C)working on
(D)working for

參考答案

答案：C[無官方正解]
難度：適中0.5
統計：A(1),B(2),C(4),D(2),E(0)