Scientists say it may be five or six years _____ it is possible to test this medicine to human patients.
#92420
A
since
B
after
C
before
D
when
推荐题目
Not until I came home last night ________ to bed .
#95211
A
Mum did go
B
did Mum go
C
went Mum
D
Mum went
She _____volleyball regularly for many years when she was young.
#92901
A
played.
B
was playing
C
has played.
D
had played
______ 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
It suddenly _________ to the detective that the millionaire was probably murdered by his own daughter.
#92369
A
happened
B
occurred
C
thought
D
took place
My cousins _______ me and ask me what I was doing when I was studying in Canada.
#93498
A
used to ringing
B
were used to ring
C
were used to ringing
D
used to ring