A.is taking | B.was taking | C.took | D.had taken |
A.called for | B.are calling for | C.have called for | D.will call for |
A.are affecting | B.are being affected by | C.are being effected by | D.are effecting |
A.was received | B.had received | C.has received | D.has been received |
A.are using, have added | B.is used, are adding |
C.are being used, have been added | D.being used, were added |
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