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 bought a robot _______ have more free time.
#43352
A
because
B
therefore
C
in order to
D
as a result
——There are many ________between them.—— Yes. ________ people think ________.
#39522
A
different, Difference, differently
B
difference, Different, differently
C
differences, Different, differently
D
differently, Difference, different