— 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 |
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— 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 |
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