No sound and no voice for a while. A. have heardB. has heardC. has been heardD. have been

网友回答

A. have heard
B. has heard
(答案→)C. has been heard
D. have been heard
解析：考查主谓语的一致性和现在完成时的被动语态。No—and no----指同一概念，作主语时用单数，且与hear为被动。