摘要： did they
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________did they arrive here yesterday，at five o'clock________at six o'clock？
- A.Where，and
- B.When，and
- C.When，or
- D.How，or
—Did they clean the house yesterday afternoon?
—______. They cleaned it this morning.
| A．No, they don’t | B．Yes, they did |
| C．No, they didn’t | D．Yes, they do |