中国大学MOOC: We have had to the new system quickly.
举一反三
- 中国大学MOOC: We need to ensure a smooth ______ from the old system to the new one.
- We have to weigh the ______ of the new system against the benefits it will bring.
- We have had to adapt quickly_____the new system.
- We have moved into a house. We did that recently The house was new. It had single-storied. A: We have moved into a new house recently. B: We have moved into a new single-storied house at present. C: We moved into a new single-storied house recently. D: We have moved into a new single-storied house recently.
- We [u] [/u] a party to welcome the new students next Friday evening. A: have B: had C: will have D: have had