Many other new techniques are now available that enable more research _______ (do) in the test tube to see if chemicals produce harmful biological effects.
【正确答案】：to be done
【题目解析】：enable sth. to be done使能够做某事
Many other new techniques are now available that enable more res
- 2024-07-19 15:07:32
- 英语（二）(00015)