1.Luckily,I _______________ buy the ticket yesterday.( )
A. | was able to | B. | could to | ||
C. | am able to | D. | could be able to |
19.The factory we visited today is no longer what it 20years ago,when it was poorly equipped.( )
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A. | used to being | B. | used to | C. | was used to | D. | used to be |