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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单项选择题

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

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

单项选择题

It isn't surprising （）the actor is very popular in Taiwan

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

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