Much research _________ (do) before that man-made material was produced.
举一反三
- 不要用锉刀去除太多的物质。 A: Do not remove too much material with the file. B: Do not expel too much material with the file. C: Take care not to extract too deeply.
- Do some research on the hiring company and its industry before the interview.
- what would the boss do before he made a decision?
- In much of Latin America, Appointments must be made ___________ in advance by _________ or __________ and then followed up ___________ before meeting.
- The bag is made _______ man-made leather. A: in B: on C: of D: to