She looks very sad. I want to help her, but I just don’t know ____ to do it.
#54031
A
what
B
when
C
how
D
which
推荐题目
As students, we should work hard and do ________ best to realize our dreams.
#37874
A
us
B
our
C
ours
D
ourselves
Kitty found _________ interesting _____________ the difference between the twins.
#54347
A
/, to learn
B
it, learning
C
it, to learn
D
/, learning