A.did he do | B.he did | C.does he do | D.has he done |
A.light travels | B.does light travel |
C.is light travelling | D.light is travelling |
A.Is it all right? | B.I’m afraid I won’t be free | C.Yes, I will | D.That’s great. |
A.don’t think | B.never think | C.didn’t think | D.never thought |
A.Not exactly | B.Not really | C.Not a little | D.Not at all |
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