In today's world, people are lazier, but in the past ...

★ Grammar - used to

In today’s world, people are lazier, but in the past they ______ harder.

A. use to work

B. used to work

C. didn’t use to work

D. didn’t used to work

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I don’t stay with my parents now, but I ______ with them in Paris.

A. use to live

B. used to live

C. didn’t use to live

D. didn’t used to live