In my point of view, the question is not _____ the world is going to have a new economic crisis, but when.
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that
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how
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what
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whether
推荐题目
Courage is a good quality and is ________ it takes to get over difficulties.
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that
B
what
C
which
D
where
Nowadays school bus safety has drawn much attention nationwide for children’s safety is _______ worries parents most.
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why
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which
C
that
D
what
Einstein’s most famous theory is ______ we call the Theory of Relativity.
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what
B
that
C
which
D
why