Where is my ball? I remember I put it here yesterday.
--You it in the wrong place.
| A．must put | B．might put | C．should have put | D．might have put |
The notice ______ “No smoking”. A is told B reads C tells D is read
The doorbell had been ringing for several minutes before it ______.
A answered B had answered C was answering D was answered
The box _____. Better call in a mechanic(修理工).
A isn’t open B hasn’t been open C isn’t be open D won’t open
The workers _____busily when the boss came to look for something she ______in the office.
A had worked, had leftB were working ; had left C working ; had left D had worked; left
I’m afraid it will be two months______.
A when I come back B when I’ll come back C before I come back D before I’ll come back