—Could you tell me whom the radio _____
问题:
—Could you tell me whom the radio _____ by?
—Sorry, I have no idea. [ ]
A. invents
B. invented
C. is invented
D. was invented
—Could you tell me whom the radio _____ by?
—Sorry, I have no idea. [ ]
A. invents
B. invented
C. is invented
D. was invented