21. I was born in China and have been living here. I can’t imagine ______ anywhere but China.
A. work B. working C. to work D. having worked
22. --Did you hear something?
--No. I ______ but I ______ anything at all.
A. listened; have heard B. have listened; hear
C. am listening; hadn’t heard D. was listening; couldn’t hear
23. I am optimistic ______ my chances of getting the job.
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