It was never clear ________ the man hadn't reported the accident sooner.(2011·江苏)
| A．that | B．how | C．when | D．why |
---What on earth are the police busy with?
---They have been looking into how the plane crash _______.
| A．came out | B．came up | C．came down | D．came about |
Each country, of course, in _______ Copenhagen has its own particular priorities and concerns, which is why ________ agreement is so difficult to reach.
| A．the; an | B．/; an | C．a; the | D．/; the |
I’m sorry to tell you that we will not tell you the results of the survey until we have looked through all the _______.
| A．directions | B．instructions | C．data | D．standards |
The ground is wet all over, so I’m sure it must have rained last night, ________?
| A．wasn’t it | B．didn’t it | C．isn’t it | D．doesn’t it |
________ is know to us all is that the old worker, for _______ life was hard in the past, still works hard in his seventies.
| A．As; whom | B．What; whose | C．It; whose | D．What; whom |