問題詳情

18. While watching television, __________.　　
(A)the doorbell rang 　　　　
(B)the doorbell rings　　
(C)we heard the doorbell ring
(D)we heard the doorbell rings

參考答案

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