When I try to understand ________ that prevents so many children from being happy, there seem to be three causes.
#84675
A
why it is
B
what it does
C
why it does
D
what it is
推荐题目
 It was in 1945______ World War II ended. 
#84684
A
that
B
when
C
since
D
Before
 I wonder ______ you were doing last night.
#85416
A
it was what that
B
what was it that
C
that what it was
D
what it was that