________when the mayor agreed to solve their problems did th

________when the mayor agreed to solve their problems did the taxi drivers who were on strike gradually leave.
A.For.B.As.C.Only.D.With
这句话我都没看明白是什么意思,还有选C,不选别的的原因,

C.Only 是对的.
这是一个倒装句.-------Only+状语位于句首时,句子要部分倒装,语序：Only+状语+助动词+主语+谓语.正常语序是：The taxi drivers who were on strike gradually left only when the mayor agreed to solved the problems.这个句子虽长,骨干却是一个“主语--谓语”的句式,主语：The taxi drivers,谓语：left.而 who were on strike 是定语从句,修饰the drivers的；when the mayor agreed to solved the problems是时间状语从句.

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