— I think your father is very busy.—So he is. he still takes a walk with us sometimes.A. S

问题补充：

— I think your father is very busy.

—So he is. he still takes a walk with us sometimes.

A. SoB. And C. Or d. But

答案：

解析：连词的用法。so因此，表结果；and又，而，表并列或承接；or 或者，否则，表示选择；but但是，表转折；根据句意，他确实很忙，但有时他仍然与我们一起散步。故选D。