— I rang you up last night, but nobody answered.
— Oh, I usually off my phone at about 9:00 p.m.
A. switched
B. have switched
C. switch
D. had switched
网友回答
A. switched
B. have switched
(答案→)C. switch
D. had switched
解析：考查时态：句意：昨晚我打电话给你，但是没有人接电话。--哦，我通常下午九点关手机。因为是通常做…，用一般现在时，选C。