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-- Why bother? There is too much rubbish here. You’ll never pick it all up.

       --- Maybe not. But at least this part of the park          cleaner.

       A. was                B. will be          C. had been    D. is

-- Why bother? There is too much rubbish here. You’ll never pick it all up.

       --- Maybe not. But at least this part of the park          cleaner.

       A. was                B. will be          C. had been    D. is

--- Why bother? There is too much rubbish here. You’ll never pick it all up.

　 --- Maybe not. But at least this part of the park _____ cleaner.

　 A. was　　　　　 B. will be　　 　 C. had been　 D. is