Scientists say it may be five or six years_______it is possible to test this medicine on human patients.
#92600
A
when
B
after
C
before
D
since
推荐题目
She ______buy her clothes through the Internet than in the supermarket.
#93321
A
rather than
B
would like
C
no longer
D
would rather
Newton was sitting under an apple tree ______ an apple fell onto his head.
#92858
A
when
B
while
C
after
D
before
Although punctual himself, the professor was quite used ________ late for his lecture.
#94923
A
to have students
B
for students’ being
C
for students to be
D
to students’ being