What is concerning us greatly is ____ the workers held up in that area yesterday will be set free.
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A
that
B
what
C
when
D
which
推荐题目
Water, which seems to be so simple and common, is ______ makes life possible.
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A
that
B
which
C
what
D
where
_______ is even important is ______ as the earth cooled down, water began to appear on its surface.
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A
That, that
B
What, that
C
What, what
D
It, that
Is this research center _________ you met some foreign guests last week?
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A
that
B
where
C
which
D
in which