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
Science and technology are developing ______ quickly that some new electronic products are out-of-date within several months.
#92298
A
very
B
so
C
such
D
too
Bill wasn’t happy about the delay of the report by Jason, and ___________.
#93579
A
I was neither
B
neither was I
C
I was either
D
either was I
It wasn’t until nearly a month later _______ I received the manager’s reply .
#95192
A
since
B
when
C
as
D
that
Don’t forget it’ll be the first time ____ in public
#94859
A
I’ve spoken
B
I shall speak
C
I will speak
D
I speak
-Do you think we can get to the village before dark，Daddy? -Yes，honey， the car doesn’t break down．
#93270
A
even if
B
as far as
C
so long as
D
unless