摘要： ---What are you busy with ? --- We are carrying out a research the causes of cancer. A. into B. onto C. to D. in
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---What are you busy with ?
--- We are carrying out a research ____ the causes of cancer.
|
A．into |
B．onto |
C．to |
D．in |
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---What are you busy with ?
---We are carrying out a research ______ the causes of cancer.
- A.into
- B.onto
- C.to
- D.in
---What are you busy with ?
--- We are carrying out a research _______ the causes of cancer.
A. into B. onto C. to D. in
查看习题详情和答案>>