They____the maths problem when I came in.A.worked on B.were working on C.were working D.were working for

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They____the maths problem when I came in.A.worked on B.were working on C.were working D.were working for
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They____the maths problem when I came in.A.worked on B.were working on C.were working D.were working for
They____the maths problem when I came in.
A.worked on B.were working on C.were working D.were working for

They____the maths problem when I came in.A.worked on B.were working on C.were working D.were working for
B.句型

b

B