— The doctor is busy ________ his work.
#48117
A
at
B
for
C
with
D
on
推荐题目
All animals _______ men feed on plants or other animals.
#45908
A
among
B
including
C
except
D
with
 I often go to school            every day.
#47182
A
by bus
B
by a bus
C
by the bus
D
on bus
The pay phone is ____ the post office  ____ the library.
#48909
A
across from
B
between…and
C
next to
D
in, of