A study ________ in the USA in 1977 showed that the chemical ASA in aspirin could prevent a stroke.
#95255
A
carrying out
B
carried out
C
working out
D
worked out
推荐题目
Hearing his words,I couldn’t decide ______or remain.
#98469
A
whether to go abroad
B
if I go abroad
C
if to go abroad
D
to go abroad