问题补充：
Only when possible to settle the problem.
A. does the chief editor come will it be
B. the chief editor comes will it be
C. has the chief editor come it will be
D. the chief editor comes it will be
答案：
A. does the chief editor come will it be
(答案→)B. the chief editor comes will it be
C. has the chief editor come it will be
D. the chief editor comes it will be
解析：only修饰状语从句位于句首时，只是主句要部分倒装，而从句是用正常语序。
