摘要：9．-Why is Mary so late? -I don't know . A．can what the reason be B．what the reason can be C．the reason what can be D．what can the reason be
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---Why is Mary so late?
---I don’t know ________．
- A.can what the reason be
- B.what the reason can be
- C.the reason what can be
- D.what can the reason be