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.

admin2007-10-13  66
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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