单项选择题

It comes as a great shock to us （）the president has no money

A. whether
B. if
C. that
D. for

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单项选择题

We're not sure （）the economy can improve in the near future

A. if
B. this
C. those
D. why

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I'm not sure （）this plan will work or not

A. how
B. what
C. whether
D. that

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