Experts have been warning _____ of the health risks caused by passive smoking.
#28424
A
at a time
B
at one time
C
for some time
D
for the time
推荐题目
My aunt has worked in a clinic ____2008.
#28845
A
after
B
before
C
till
D
since
Research universities have to keep up with the latest computer and scientific hardware __________ price. 
#27260
A
on account of
B
in addition to
C
regardless of
D
not to mention
_____your poor record in school , we think you should study harder.
#25838
A
In charge of
B
In case of
C
In spite of
D
In view of