Carbon dioxide ___ from burning fuels is the most common of the so-called greenhouse gases.
|
A．producing |
B．having been produced |
|
C．to be produced |
D．produced |
Father finally came back home, which I ___ forward it.
|
A．had been looking |
B．have been looking |
|
C．looked |
D．have looked |
Determination is a kind of basic quality and this is ___ it takes to do jobs well.
|
A．what |
B．that |
|
C．which |
D．who |
The secretary is very careful and never ___ any little points in her daily work.
|
A．overcomes |
B．overlooks |
|
C．refuses |
D．denies |
Jack offered us a big meal when he was leaving the office, but our work ____, we refused it.
|
A．not finished |
B．had not been finished |
|
C．not having finished |
D．wasn’t finished |
In the library new books have to be ___ before they are put on shelves for reader’s use.
|
A．listed |
B．combined |
C．classified |
D．made |
