—I went to see you yesterday evening. But you weren’t in. Where were you then？ —I a walk b

—I went to see you yesterday evening. But you weren’t in. Where were you then？
—I a walk by the lake with my husband．
A. was having
B. am having
C. have had
D. have

(答案→)A. was havingB. am havingC. have had D. have解析：对于昨天你看我的时候，我在做的事应该是过去正在做的事，故要用过去进行时，结构为be+doing，主语是第一人称，be用过去式was，故选A。

我明天再问问老师，叫他解释下这个问题