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

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

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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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成人本科学位英语

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