．—Let’s back up. Where was I?—.A. You were in the kitchen. B. You left your book at home.C

问题补充：

．—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.

答案：

A. You were in the kitchen.

B. You left your book at home.

C. You were having a rest.

(答案→)D. You were talking about the cause.

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