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 |
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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 |