The engineer will return from Macao a few days.A. sinceB. inC. onD. after

问题补充：

The engineer will return from Macao a few days.

A. since

B. in

C. on

D. after

答案：

A. since

(答案→)B. in

C. on

D. after

解析：本题的含义为几天后，工程师将从澳门返回，in表示在一段时间之后，用于将来时，故本题选B。