A.work | B.have been working | C.had been working | D.am working |
A.I am not noticing it | B.I haven’t noticed it | C.I wasn’t noticing it | D.I had not noticed it |
A.washed; had done | B.wash; have done | C.washed; have done | D.wash; had washed |
A.is preparing | B.was preparing | C.had been preparing | D.has been preparing |
A.had taught | B.taught | C.is teaching | D.has been teaching |
A.will stay | B.were staying | C.have stayed | D.stayed |
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