Ann and Idoinghomework now.A. am theirB. are theirC. are ourD. am our

问题补充：

Ann and Idoinghomework now.

A. am ,their

B. are ,their

C. are ,our

D. am ,our

答案：

A. am ,their

B. are ,their

(答案→)C. are ,our

D. am ,our

解析：本题的主语为Ann and I，表示复数形式，故be 动词为are，根据题意，用物主代词our，故选C