Sally is busy ______ her homework.
#51173
A
in
B
at
C
with
D
on
推荐题目
The government decided to take some action _______ the situation turned too bad.
#49281
A
until
B
unless
C
when
D
before
The nature reserve is a good place _______ wild animals ____ live ___.
#47870
A
to, to, at
B
for, to, with
C
for, to, in
D
to,for,in
