问题
选择题
| — Someone is knocking at the door. Who can _____ be? — I will go and answer it. |
A. she B. they C. he D. it |
答案
答案：D
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| — Someone is knocking at the door. Who can _____ be? — I will go and answer it. |
A. she B. they C. he D. it |
答案：D