we can not figure out ____quit a number of insects ,birds ,and animals are dying out .
| A．that | B．as | C．why | D．when |
相关试题
--The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job?
---____ my students have a try?
| A．May | B．Must | C．Will | D．Shall |
A series of stimulus policies and supportive measures taken by the government _____ to promote change in the economic environment in this area.
| A．are expecting | B．are expected | C．is expecting | D．is expected |
---Where did you come across our chemistry teacher ?
--- It was in the supermarket ______I purchased mooncakes．
| A．that | B．which | C．where | D．When |
________ the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.
| A．While | B．As | C．Because | D．If |
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