问题补充：
My friend, Tom, may have missed taking the flight to Africa, he can’t arrive for another hour.
A. in which case
B. in that case
C. in case
D. in any case
答案：
(答案→)A. in which case
B. in that case
C. in case
D. in any case
解析：考查定语从句，in which case在这种情况下，因为这是非限制性定语从句，用关系代词which，句意：我的朋友汤姆，可能错过了去非洲的航班。这样的话，再有一个小时他到不了。选A.
