Although Fleming discovered Penicillin, it was over a decade ______ someone else turned it into the great drug of the 20th century. 
#92265
A
before
B
since
C
when
D
as
推荐题目
He's late, __is often the case. 
#92571
A
as
B
what
C
it
D
this
It will be a long time           Mr Black            back from abroad.
#94801
A
before;comes
B
since;has come
C
before;will come
D
after;will come
In many parts of China, ________ the idea ______ boys are more important than girls.
#93015
A
it has; which
B
there exists; that
C
there is existing; which
D
there remains to be; that