—I called you at 9 last night，but no one answered.
—Sorry，I ________ sleeping.I went to bed very early.
| A．need have been | B．would have been |
| C．must have been | D．should have been |
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—I called you at 9 last night，but no one answered.
—Sorry，I ________ sleeping.I went to bed very early.
| A．need have been | B．would have been |
| C．must have been | D．should have been |
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