31. —How longeach other before theymarried?—For about a year.A. have they known getB. did

问题补充：

31. —How longeach other before theymarried?

—For about a year.

A. have they known, get

B. did they know, were going to get

C. do they know, are going to get

D. had they known, got

答案：

A. have they known, get

B. did they know, were going to get

C. do they know, are going to get

(答案→)D. had they known, got

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