The noise of the desks _____ could be heard in the next classroom.
A: being opened and closed
B: opened and closed
C: having been opened and closed
D: to be opened and closed
A: being opened and closed
B: opened and closed
C: having been opened and closed
D: to be opened and closed
A
举一反三
- At the beginning of the class,the noise of desks ________could be heard outside the classroom. A: opened and closed B: to be opened and closed C: being opened and closed D: to open and close
- The noise of desks___could be heard out in the street. A: opened and closed B: to be opened and closed C: being opened and closed D: having been open and closed
- 4.Howare they opened? How are they closed?
- A．openedB．closedC．openD．close A: opened B: closed C: open D: close
- Thousands of workers lost their jobs when their factory _________. A: ended B: closed C: opened D: cleaned
内容
- 0
Each cylinder has one starting valve which is usually opened by air pressure and closed by （）
- 1
The small bar ______. A: opened at midnight B: didn't close until after midnight C: closed before midnight
- 2
Keeping your laptop ___________in all the time will kill its battery faster. A: plugged B: unplugged C: opened D: closed
- 3
— The shop is ______ on Saturday and Monday. — I see. I'll go here on Monday then. A: opened B: close C: closed
- 4
The switch in the circuit in Figure below has been closed for a long time, and it is opened at t ≥0. Calculate the initial energy stored in the capacitor.[img=525x227]1803a2007b1f992.png[/img]