They have earned lots of money so I believe that the business is a success. A. mildlyB.

问题补充：

They have earned lots of money, so I believe that the business is a success.

A. mildly

B. firmly

C. actively

D. tightly

答案：

A. mildly

(答案→)B. firmly

C. actively

D. tightly

解析：考查考查副词辨析。句意：他们已经赚了很多钱，因此我坚信那个公司是成功的。A温和地；B稳固地，坚定地；C积极地；D紧紧地。故选B。