Lately some scientists are experimenting ___________ white mice to ____________ this kind of medicine.
A．on,try onB．with, test onC．on ,test outD．with,carry out
C
句意：最近一些科學(xué)家正在在白鼠身上做實驗來檢測這種藥。短語：experiment on 在什么上做實驗，test out 檢測，測試，所以選C。
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