问题
Lately some scientists are experimenting _____ white mice to _____ this kind of medicine[ ]
A: on, try on
B: with, test on
C: on, test out
D: with, carry out
B: with, test on
C: on, test out
D: with, carry out
正确答案是：
同类题型
This is a junior school. You should go to a senior school____ girls of your age.
TV says there will be a storm tomorrow.—_________. I planned to go climbing with my classmates.
Johnny, you ________ play with the knife. You ________ hurt yourself.
The police got to an old school _______the farmers used as a store