科目： 來源：xxyy 題型：
| I have ____________ boots and ____________ umbrella. |
A. a, a B. two, a C. a pair of, an D. a pair of, a |
科目： 來源：xxyy 題型：
| —What are you doing? —_____. |
A. We are singing. B. We are students. C. We are at home. D. Yes, we are. |
科目： 來源：xxyy 題型：
| I live in _____ house. She lives in _____ apartment. |
A. a; an B. an; an C. an; a |
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