A.has worked | B.works |
C.has been working | D.is working |
A.It is | B.It was | C.It has been | D.It had been |
A.arrive | B.arrived | C.have arrived | D.had arrived |
A.have just finished | B.am just finishing |
C.had just finished | D.am just going to finish |
A.was; would have been studying | B.had fallen; would study |
C.has been; would have studied | D.fell; would be studying |
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