We want to know       he will come back, as we are worried about his safety.
#37328
A
how often
B
how soon
C
how much
D
how long
推荐题目
I’d like to trek ______ the jungle. 
#40471
A
through
B
across
C
over
D
On
---It ___ me nearly 2 hours ___ my homework every day. ---Me, too.
#43650
A
costs; do
B
spends; doing
C
takes; to do
D
spent; doing
Don’t pay for the coffee. It’s        .
#35727
A
good
B
tasty
C
boring
D
free
If I’m free,I’d like to spend ______holiday in Dunhuang.
#36311
A
three days
B
a three-day
C
three-day
D
three day