Only when possible to settle the problem.
A. does the chief editor e will it be
B. the chief editor es will it be
C. has the chief editor e it will be
D. the chief editor es it will be
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A. does the chief editor e will it be
(答案→)B. the chief editor es will it be
C. has the chief editor e it will be
D. the chief editor es it will be
解析：选B。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。