So although Fleming discovered penicillin, it was over a decade ___________someone else turned penicillin into the great drug of the 20th century.
#34272
A
when
B
that
C
before
D
unless
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Ray is a new graduate, and it seems that he has difficulty in dealing with ________ problems arise.
#30807
A
whichever
B
whenever
C
whatever
D
wherever
______ nearly all behavior is learned behavior is a basic assumption ______ has been put forward by the social scientists.
#31572
A
What, that
B
That, what
C
What, what
D
That, that
It has been 60 years ______ the two countries established diplomatic ties.
#33197
A
that
B
after
C
from
D
since
We do not have enough money.________，we cannot afford to buy the new car.
#32754
A
However
B
Anyway
C
Therefore
D
Though
—People often don't appreciate what they have, do they? —No, _________ they lose it.
#30726
A
if
B
after
C
until
D
when