7).Only when____ possible to settle the problem

题目

7).Only when____ possible to settle the problem
A.does the headmaster come will it be
B.the headmaster comes will it be
C.has the headmaster come it will be
D.the headmaster comes it will be)
这不是个倒装句吗 答案选第二个我很迷茫

答案

是倒装句,不过不是the headmaster comes 倒装
而是后面it will be 倒装为will it be,因为the headmaster comes 是和前面的when连在一块构成状语,只能后面倒装