Scientists say it may be one year or so ________ it is possible to test the new medicine on human patients.
#32551
A
when
B
after
C
before
D
since
推荐题目
Failure can make a positive contribution to your life _______ you learn to use it.
#33895
A
since
B
unless
C
until
D
once
Everything was placed exactly ______ he wanted it for the graduation ceremony.
#31234
A
while
B
when
C
where
D
though
— How long has your brother been working in this factory? — he graduated from college.
#31430
A
When
B
By the time
C
Until
D
Ever since
Hurry up ___ we ___ miss the train.
#31681
A
and, are about to
B
or, are about to
C
or, will
D
and, shall