．—Let’s back up. Where was I?
—______.
| A．You were in the kitchen. | B．You left your book at home. |
| C．You were having a rest. | D．You were talking about the cause. |
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．—Let’s back up. Where was I?
—______.
| A．You were in the kitchen. | B．You left your book at home. |
| C．You were having a rest. | D．You were talking about the cause. |
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