(Those of us) who work in chemical (laboratories) should have (their) lungs (che

游客2025-03-17 10

问题 (Those of us) who work in chemical (laboratories) should have (their) lungs (checked) quite regularly.

选项 A、Those of us
B、laboratories
C、their
D、checked

答案 C

解析应改为our，代指前面的those of us。

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