摘要： - does the history lesson start? -At nine o'clock. Let's go at once. A. What B. When C. How

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_______— does the history lesson start?

—At nine o'clock.　Let's go at once.

A.　What 　　B.　When 　C.　How

---______ does the history lesson start?
---At nine o'clock.　Let's go at once.

---______ does the history lesson start?---At nine o'clock. Let's go at once.