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單項(xiàng)選擇題

One potential danger is（）the information could be used by others to your disadvantage.

A.that
B.what
C.it
D.which

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This fire extinguisher is to be used only in case of（）

A.urgency
B.crisis
C.immediacy
D.emergency

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She's part of a team of scientists who are（）upon cancer research.

A.worked
B.arranged
C.engaged
D.involved