—Were you at home at 9:00 last night? I called you but nobody answered.—Sorry, I ________ at that time.
A:take a shower
B:took a shower
C:was taking a shower
D:am taking a shower
一种电子抽奖方式是:一次抽奖点击四次按钮,每次点击后,随机出现数字1,2,3,4.当出现的四个数字不重复,且相邻两数字不是连续数字(即两个数字差的绝对值为1)时,获头奖,则第一次抽奖获头奖的概率为( )