The woman lived a hard life with her children ________ her husband's death.
The woman lived a hard life with her children ________ her husband's death.
A.at
B.upon
C.in
D.by
答案及解析： B
The woman lived a hard life with her children ________ her husband's death.
A.at
B.upon
C.in
D.by
答案及解析： B