— I called you last night, but nobody answered.
— Oh, I usually _____ off my call phone by 8:00 p.m.

A. switched
B. have switched
C. switch 
D. had switched
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科目：高中英語 來源：安徽省模擬題 題型：單選題

— I called you last night, but nobody answered.
— Oh, I usually _____ off my call phone by 8:00 p.m.
[     ]
A. switched
B. have switched
C. switch 
D. had switched

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