A.had attended ... three days before | B.attended ... three days ago |
C.would attend ... since three days | D.was attending ... for three days |
A.serves | B.serving | C.to serve | D.is served |
A.having sold | B.to be sold | C.selling | D.sells |
A.had been studying | B.have been studying |
C.have studied | D.are studying |
A.proved to | B.proved us | C.was proved | D.proved |
A.have damaged | B.are damaging | C.damaged | D.will damage |
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