The doctor must be _______ 24 hours a day, 7 days a week in the boarding school.
#25574
A
on call
B
by hand
C
in sight
D
on spot
推荐题目
My uncle lives＿＿＿＿116 Changhe Street. His room is ＿＿＿＿the sixth floor.
#28753
A
at； on
B
to； at
C
on； in
D
of； to
The research project has only been ______ for three months, so it’s too early to comment on its success.
#26694
A
in the way
B
by the way
C
under the way
D
under way
PSAs are often run _____ free, and are ______ to educate people about health, safety, or any other problem that affects public welfare.
#26545
A
for, mean
B
for, meant
C
of, to mean
D
in, meaning
— _________, this math problem seemed quite simple to me, but when I tried to work it out, I just couldn’t.— There are always things like this, I think.
#27613
A
On one hand
B
In my opinion
C
At first sight
D
On its own
Christmas is a Christian holy day usually celebrated on December 25th ____ the birth of Jesus Christ.
#26631
A
in accordance with
B
in terms of
C
in favor of
D
in honor of