If you succeed you will have to work hard. A. are about toB. are going toC. willD. are t

问题补充：

If you succeed, you will have to work hard.

A. are about to

B. are going to

C. will

D. are to

答案：

A. are about to

B. are going to

C. will

(答案→)D. are to

解析：be to do 结构表“打算、决心、命令等”。 句意：如果你打算成功你必须努力。