A.solving | B.had been solved | C.was solved | D.solved |
A.will take | B.will be taken | C.takes | D.is taken |
A.washes | B.is washed | C.has been washed | D.is washing |
A.comes | B.have been | C.came | D.had come |
A.were followed | B.have been followed | C.are being followed | D.are following |
A.designed | B.has been designed |
C.will be designed | D.will have been designed |
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