----I wonder how much for your services. ----The first two are free      the third one costs $30.
#26652
A
while
B
until
C
when
D
before
推荐题目
 We have already placed an order ____ that company _____ the machines.
#27602
A
for; with
B
for ; for
C
with; for
D
to; with
Did you have trouble _______ the post office? 
#28779
A
to have found
B
with finding
C
to find
D
in finding
 After we walked ______ the forest, and ______ a river, we arrived at that small village.
#28311
A
across; across
B
through; across
C
across; through
D
through; through