To protect the environment ,we have done to stop all kinds of pollution.
A. useful nothing
B. something useful
C.anything useful
相关试题
Last Sunday Maria and Jane _____ kites in the park.
| A．flew | B．flying |
| C．fly | D．flies |
Look! The students _____ the classroom.
| A．clean | B．are cleaning |
| C．are clean | D．cleaning |
—May I use your bike?
—_____
| A．Of course not. | B．Of course. Here you are. |
| C．I don’t have a bike. | D．No, thanks. |
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