1.
No one can change what's already happened. It's important that we need to know ____.
A.
howshouldwelearnfromtheexperience
B.
whethercanwelearnfromtheexperience
C.
whoweshouldlearnfromtheexperience
D.
whatweshouldlearnfromtheexperience
【考点】
宾语从句的陈述语序;
what引导的宾语从句;