-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

国内鱼类急性毒性试验中广泛应用的鱼种为：（）

A、鲢鱼

B、食蚊鱼

C、虹鲋鱼

D、大麻哈鱼