---Someone is knocking at the door. Who can be? ---I will go and answer it. A. s
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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
试题答案
D

---Someone is knocking at the door. Who can _____ be?
---I will go and answer it.
A. she B. they C. he D. it
D