A feather falls slower than a stone only because the air holds the feather back more than it ______ the stone.
| A．does | B．holds | C．will | D．is |
相关试题
. _____ by the advances in technology, many farmers have set up wind farms on their land.
| A．Being encouraged | B．Encouraging |
| C．Encouraged | D．Having encouraged |
_____ the police thought he was the most likely one, they could not arrest him since they had no exact proof about it. 
| A．Although | B．As long as | C．If only | D．As soon as |
The wild flowers looked like a soft orange blanket _____ the desert. 
| A．to cover | B．covered | C．cover | D．covering |
30. My parents have promised to come to see me before I _____ for Africa. 
| A．have left | B．leave | C．left | D．will leave |
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