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  3. AThose of us who work in chemical Blaboratories should have Ctheir lungs Dchecked quite regularly.

AThose of us who work in chemical Blaboratories should have Ctheir lungs Dchecked quite regularly.

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问题 AThose of us who work in chemical Blaboratories should have Ctheir lungs Dchecked quite regularly.
选项 A、 
B、 
C、 
D、 
答案C
解析 应改为our。用来代指前面的those of us应用相应的第一人称。
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