17.So fast ______ that it is difficult for us to imagine its speed.( )
| A. | light travels | B. | light has travelled | ||
| C. | does light travel | D. | travels light |
16.I'm sorry I'm busy now.If I______time,I would certainly go to the theatre with you.( )
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| A. | have | B. | had | C. | have had | D. | had had |