A.joined | B.been in | C.joined in | D.taken part in |
A.don"t know…were | B.hadn"t known…are |
C.haven"t known …are | D.didn"t know … were |
A.tried; managed | B.managed; tried |
C.tried; tried | D.managed; managed |
A.write | B.be written | C.mark with | D.be marked with |
A.should exist; masters | B.exist; controls | C.exists; masters | D.exists; controls |
A.cleaned | B.being cleaned | C.to clean | D.Cleaning |
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