单项选择题

The UN is spending 800 troops to （） the army patrolling the border are.

A. form
B. force
C. reform
D. reinforce

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It's difficult to believe that this little brown thing will eventually turn （） a beautiful butterfly.

A．out
B．around
C．to
D．into
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Should the opportunity （）, I'd love to go to China.

A. arise
B. arose
C. arises
D. arising
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