摘要：13．I am sorry to have kept you so long．
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---I am sorry to have kept you ___________.
---It doesn't matter. I've just come.
A．wait B．waited C．waiting D．to wait
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---I am sorry to have kept you ___________.
---It doesn't matter. I've just come.
| A．wait | B．waited | C．waiting | D．to wait |
---I am sorry to have kept you ___________.
---It doesn't matter. I've just come.
| A．wait | B．waited | C．waiting | D．to wait |