Your ability has never been in doubt-- the question is you are prepared to work hard.A. t

问题补充：

Your ability has never been in doubt-- the question is you are prepared to work hard.

A. that

B. whether

C. if

D. how

答案：

A. that

(答案→)B. whether

C. if

D. how

解析：可联系答.案.网客服索取。