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--How long ___________ each other before they__________ married?

--For about a year.

31. —How long_________each other before they_________married?

—For about a year.

31. —How long_________each other before they_________married?
—For about a year.

--How long ___________ each other before they__________ married?
--For about a year.

—How long ________ each other before they ________ married?

—For about a year.

[　　]

A．have they known; got .

B．did they know; were going to get

C．do they know ; are going to get

D．bad they known; got