问题补充:
Don’t bother Tom, he is with the experiment on water molecules in the lab.
A. focused
B. fixed
C. occupied
D. concentrated
答案:
A. focused
B. fixed
(答案→)C. occupied
D. concentrated
解析:查固定词组。Be occupied with…忙于…句意:不要去麻烦Tom。,他正忙于在实验室里做实验。根据句意说明C正确。