It was not until 1911, _______ the first vitamin was identified, _______ people realized the importance of it．
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A
when; which
B
when; that
C
that; which
D
that; that
推荐题目
It was about 600 years ago ______the first clock with a face and an hour hand was made .
#85478
A
that
B
until
C
before
D
when
--- Where did you get such a beautiful skirt? --- It was at the department store ____ we used to shop.
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A
that
B
there
C
where
D
which
It was in the small house ________ was destroyed by the flood ________ he spent his childhood.
#84966
A
which; that
B
that; where
C
which; where
D
that; which
It is the ability you have _____ matters, not where you graduate from or what you look like.
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A
which
B
that
C
what
D
it
—How unhappy your roommate looks!—Yes, but he's not willing to tell me what it is ________ is troubling him.
#84716
A
what
B
which
C
as
D
that