Scientists say it may be five or six years ______ it is possible to test this medicine on human patients.
#92459
A
before
B
after
C
since
D
when
推荐题目
In our city, citizens have free _____ to the library, which makes it easy for them to read any book they like.
#92638
A
time
B
entrance
C
charge
D
access
--- Do you know the Water Cube（水立方）at all? --- No, this is the first time I _________ here.
#92519
A
was
B
have been
C
came
D
am coming
How long do you think ____ the car factory launches a new model?
#92697
A
will it be until
B
will it be when
C
it will be before
D
it will be that
It is required that in no case ________ our password.
#93878
A
we should forget
B
should we forget
C
shall we forget
D
we shall forget
______ he returns to his native land.
#92482
A
It is long before since
B
It is before long that
C
It won’t be long before
D
It will be long after