David knocked at the door for nearly half an hour______Mary opened it, unwilling.
#30820
A
when
B
while
C
until
D
before
推荐题目
Andy can go to the cinema together with us he has finished the task．
#33132
A
unless
B
as soon as
C
until
D
as long as
– I wonder how much you charge for your services.-- The first two are free ____ the third costs $30.
#80584
A
while
B
until
C
when
D
before
The teacher explained a second time, the students should have difficulty in doing the experiment.
#31264
A
although
B
in case
C
so that
D
but
____ the movie star has always been the focus of much media attention, he tries to lead a normal life.
#31447
A
When
B
While
C
Unless
D
Since
________ advertisements are of great help, I don’t think we should entirely rely on them.
#31478
A
Because
B
Since
C
Once
D
While