Thedoctorbeganfeelinginactiveandpowerlessacoupleof...

问题详情：

      The doctor began feeling inactive and powerless a couple of days ago, but not until he developed 100.3-degree fever ______ Doctors Without Borders, authorities said.

A. had he contacted                        B. he had contacted

C. did he contact                             D. he contacted

【回答】

C

知识点：倒装与省略

题型：选择题