问题
选择题
______ the theory, the scientists asked more than sixty college students to take part in the experiment.[ ]
A. Being tested
B. To test
C. Testing
D. Tested
答案
答案：B
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______ the theory, the scientists asked more than sixty college students to take part in the experiment.[ ]
A. Being tested
B. To test
C. Testing
D. Tested
答案：B