問題詳情
( )2.Mrs. Wang was busy _________ the floor when the telephone rang.
(A) mopping
(B) to mop
(C) mopped
(D) mop
參考答案
答案：A
難度：簡單0.763158
統計：A(29),B(4),C(2),D(1),E(0)
用户評論
【LeBron James】評論
busy後應加V-ing事實上省略了on，busy (on) V-ing，介係詞(on)後應加V-ing，所以選mopping