26. While the workers _____ a hole on the road,they broke a big pipe.(A) dug (B) is digging (C) was

問題詳情

26. While the workers _____ a hole on the road,they broke a big pipe.
(A) dug
(B) is digging
(C) was digging
(D) were digging

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