People in this area are in______over the heavily polluted air.

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问题 People in this area are in______over the heavily polluted air.

选项 A、doubt
B、danger
C、trouble
D、suspense

答案C

解析 选项中四个词均可与介词in搭配使用,但意思不同。in doubt:怀疑,可怀疑的;in danger:在危险中;in trouble:处于困境(或苦恼、不幸)中;in suspense:焦急状态,悬而未决。根据句意可知,选C。
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