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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________ you need something, please don't hesitate to let me know.
#30268
A
Even though
B
In case
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As though
D
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Li Ming told me that he was interested in many sports, ___swimming, shooting, skating and so on
#31824
A
such as
B
as
C
for example
D
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He said ______ couldn’t he work out the problem but his teacher didn’t know how to do it.
#80569
A
though
B
never
C
hardly
D
not only