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___________ work in Microsoft?

    A. Did you used to          B. Did you use to

    C. Do you used to           D. Do you use to

 ___________ work in Microsoft?

    A. Did you used to               B. Did you use to

    C. Do you used to                D. Do you use to

___________ work in Microsoft?

         A. Did you used to               B. Did you use to

         C. Do you used to                D. Do you use to

—_________ work in Microsoft?    —Yes, I did.

A. Did you used to    B. Did you use to   C. Do you used to   D. Was you use to