—You didn't wait for Mr. Smith last night, did you?
—Yes, but we ________. He didn't return home at all.

----You didn’t wait for Mr. Smith last night, did you?
-----Yes, but we           . He didn’t return home at all.

----You didn’t wait for Mr. Smith last night, did you?

-----Yes, but we           . He didn’t return home at all.

A．don’t have to     B．didn’t need to     C．needn’t have     D．should have

—You didn't wait for Mr. Smith last night, did you?

—Yes, but we ________. He didn't return home at all.

—You didn’t wait for Mr. Smith last night, did you?

—Yes, but we ____. He didn’t return home at all.

A. don’t have to　 B. needn’t have C. didn’t need to　 D. should have