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
Water, _____ we cannot live, exists in the form of liquid, gas or solid.
#25883
A
from which
B
on which
C
without which
D
by which
In some cases，different approaches ________ the same scientific problem lead to conflicting theories.
#26775
A
to
B
in
C
of
D
for
(2014·海南洋浦中学测试)He is famous both________a novelist and poet but he is more famous________his novels.
#65273
A
for；as
B
with；for
C
as；for
D
like；as
I feel sure that _______ qualification, ability and experience, you are suited to the position we have in mind.
#28160
A
on account of
B
in terms of
C
on the basis of
D
in spite of
--Look! The telephone is broken. Someone damaged it ________ purpose. --That may be right. But perhaps it was broken _________ accident.
#26247
A
on; by
B
by; by
C
on; on
D
by; on