问题:
To invent a new kind of electric light, Thomas Edison did lots of ______.
[ ]
A. research
B. inventions
C. experiments
D. experiences
To invent a new kind of electric light, Thomas Edison did lots of ______.
B. inventions
C. experiments
D. experiences
[ ]
A. research B. inventions
C. experiments
D. experiences
参考答案: