--- I called you last night, but nobody answered.
--- Oh, I usually__________off my cell phone by 8:00 pm.
| A．switched | B．have switched | C．switch | D．had switched |
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--- I called you last night, but nobody answered.
--- Oh, I usually__________off my cell phone by 8:00 pm.
| A．switched | B．have switched | C．switch | D．had switched |
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