Scientists say it may be five or six years ____ it is possible to test this medicine on human patients.
#92433
A
since
B
after
C
before
D
when
推荐题目
-What’s the old man standing there? -He is _____, a new comer.
#94951
A
Mr. White
B
an engineer
C
Joe
D
Joe’s brother
--- How easy is it to find a taxi in this city?---Simply _______ your hand, and a taxi appears in no time.
#92008
A
to raise
B
raise
C
raising
D
raised
— What impresses you most about your hometown?— The street, the length of which is four times ______ it was eight years ago．
#91881
A
that
B
as
C
than
D
what