48. We have done a lot of exercises on Relative Clauses.
A. It was a lot of exercises that we have done on Relative Clauses.
B. It is a lot of exercises that are have done on Relative Clauses by us.
C. It is a lot of exercises that has been done on Relative Clauses by us.
D. It is a lot of exercises that have been done on Relative Clauses by us.
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