A. watched; have watched B. have watched; am not seeing
C. was watching; wasnt seeing D. am watching; dont see
16、He ____ writing the paper now. He hadnt written a single word when I left him ten minutes ago.
A. shouldnt be B. cant have finished C. cant be D. mustnt have finished
17、Why are the tax collectors so busy?
Many people prefer to have their tax forms completed by a professional rather than ___.
A. do it themselves B. doing it themselves C. to do it themselves D. done by themselves
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