30． I know about this competition is that it is held every two years.A. ThatB. WhatC. AsD.

问题补充：

30． I know about this competition is that it is held every two years.

A. That

B. What

C. As

D. How

答案：

A. That

(答案→)B. What

C. As

D. How

解析：可联系答.案.网客服索取。