The bus hit the huge stone by the road heavily _________ he could stop it.
A. after B. before C since D. until
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We _______ on this project for four hours. Let’s 
have a rest.
| A．are working | B．have been working | C．worked | D．had worked |
In organic farming, natural waste from animals are made use of ________ the fields.
| A．fertilizing | B．to fertilize | C．in fertilizing | D．to fertilized |
In the examination, anyone ___________ will be punished.
| A．finding cheating | B．found to cheat |
| C．found cheating | D．was found cheating |
It rained heavily in the south, _ serious flooding in several provinces.
| A．caused | B．having caused | C．causing | D．to cause |
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