_____ of the students who took part in the military training is 750.
| A．A number | B．A lot | C．Dozens | D．The number |
He is a man with rich experience , from ______much can be learned .
A whom B which C whereD what
There was _____to prevent the accident .
A something could doB anything we could do
C nothing we couldn’t doD nothing we could do
---- Is Mary coming to the concert?
---- I think ________.
| A．yes | B．it | C．that | D．so |
---- Have you been here long?
---- _______.
| A．No, not very long | B．Not much long |
| C．Yes, only little long | D．No, only yesterday |
________ mud on his trousers brushes off easily.
| A．Drying | B．Having dried | C．Being dry | D．Dried |