It never _____ humans until the mid1990s that some animals can be cloned.
#92718
A
occur
B
is occurred
C
occurred to
D
occurred
推荐题目
It will be three days __________he ________back from his home town..
#92345
A
when; will come
B
after; will come
C
since; comes
D
before; comes
In my opinion, all Mr Tom ______ good to his students in his class at present. He is very strict in their study.
#94910
A
does does does
B
does do do
C
does does do
D
did do does
The newly built stadium for the next Olympic is the present one.
#92011
A
as three big as
B
as big three times as
C
as big as three times
D
three times as big as
________, or we will be late for the meeting.
#92088
A
To hurry up
B
Hurrying up
C
Hurried up
D
Hurry up
Jack, I’m afraid I’ll turn to you．I think chemistry is _______ physics．
#93554
A
as a difficult subject as
B
a subject the same difficult as
C
as difficult a subject as
D
the same difficult subject as