then start at 9 o'clock(改成一般疑问句)

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then start at 9 o'clock(改成一般疑问句)
then start at 9 o'clock(改成一般疑问句)

then start at 9 o'clock(改成一般疑问句)
Do they start at 9 o'clock?

Do they start at 9 o'clock?