28．How can they expect to learn anythingthey never listen?A. whenB. untilC. unlessD. Thoug

问题补充：

28．How can they expect to learn anythingthey never listen?

A. when

B. until

C. unless

D. Though

答案：

(答案→)A. when

B. until

C. unless

D. Though

解析：可联系答.案.网客服索取。