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
(2009湖南四校联考)I was fortunate enough to travel to South Africa, I met some women who have organized themselves into a group.
#95040
A
then
B
there
C
while
D
where
Tom was thinking about how to explain to the teacher why he was late for class, when a good idea _______him.
#92402
A
happened
B
brought
C
occurred
D
struck
This machine is very easy ______. Anyone can learn to use it in a few minutes.
#92224
A
operating
B
to be operating
C
operated
D
to operate
It won’t be long _____ the island ________ to our motherland.
#94692
A
when, returns
B
before, will return
C
since, returns
D
before, returns
It was the third time that she ______ to this mountain village to see the children.
#92072
A
had come
B
has come
C
came
D
would come