问题补充:
Don’t stand by when you come across have difficulty in supporting their family because of serious illness.
A. Who
B. Whoever
C. Whichever
D. Whomever
答案:
A. Who
(答案→)B. Whoever
C. Whichever
D. Whomever
解析:句意:当你遇到因为重病难以养家糊口的人不要袖手旁观。这里come across后面是宾语从句,宾语从句中缺少主语用whoever引导宾语从句,相当于anyone who,whomever在从句中做宾语,whichever“无论哪个”,who引导宾语从句的意思是“谁”,所以选B。