Question

In the following question a sentence has been given in its active/passive form followed by 5 alternatives. choose the option which is the correct changed form of the given sentence.  A solution to the problem is being worked on by the engineers.

A The engineers have worked on a solution to the problem.
B The engineers were working on a solution to the problem.
C The engineers had been working on a solution to the problem.
D The engineers are working on a solution to the problem.
E None of the above
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