The head of the company promised to deal with matters of this sort he returned to his offi

问题补充：

The head of the company promised to deal with matters of this sort he returned to his office．

A. until

B. while

C. by the time

D. the moment

答案：

A. until

B. while

C. by the time

(答案→)D. the moment

解析：考查连词，until 直到，while 当什么时候，by the time 到什么时候，the moment 一……就，句意：公司的领导答应他一回到办公室就处理这种事情。所以选D。