Question

we have been working .......... 10 o'clock​

Answer 1

We have been working at 10o'clock.

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Answer 2

ʜᴏʟᴀ♥

We have been working since 10 o'clock.

ʜᴏᴘᴇ ᴛʜɪs ʜᴇʟᴘs◉‿◉