What is the correct direct speech version? The instructor asked how long we had been working on the project that day. (asked)

Question

What is the correct direct speech version? The instructor asked how long we had been working on the project that day.  (asked)

Answer

"How long had you worked on the project today?" the instructor asked.

Answer

"For how long were you working today?" asked the instructor.

Answer

"How long have you been working on the project today?" the instructor asked.

Answer

"How long are you working on the project today?" the instructor asked.

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