That's very kind  ______  you. I know it's very hard  _______  you to do that.
#41366
A
of, of
B
of, for
C
for, of
D
for, for
推荐题目
---What do you think of the bridge?---I have never seen _________  before.
#35923
A
so a long one
B
so long one
C
such a long one
D
a such long one
My father went to the post office to pick up the letter____.
#43976
A
in public
B
in for
C
in person
D
in trouble
—______do you write to your parents?-- Twice a month.
#43370
A
How often
B
How many
C
How long
D
How soon