Only when possible to settle the problem.A. does the editor come will it beB. the editor

问题补充：

Only when possible to settle the problem.

A. does the editor come will it be

B. the editor comes will it be

C. has the editor come it will be

D. the editor comes it will be

答案：

A. does the editor come will it be

(答案→)B. the editor comes will it be

C. has the editor come it will be

D. the editor comes it will be

解析：句意：直到编辑回来，这个问题才得以解决。考查Only+when从句放在句首时，用部分倒装。