The head of the pany promised to deal with matters of this sort he returned to his office．
A. until
B. while
C. by the time
D. the moment
网友回答
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。