Only when possible to settle the problem.
A. our teacher es will it be
B. does our teacher es will it be
C. our teacher es it will be
D. has our teacher e will it be
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(答案→)A. our teacher es will it be
B. does our teacher es will it be
C. our teacher es it will be
D. has our teacher e will it be
解析：考查倒装句：句意：只有当老师来了，才可能解决问题。Only后面接时间状语从句的时候，后面的从句倒装，从句中不能倒装，will放在it前面，选A。