---Why you are so worried?
--- I ___for my little son all the afternoon, I don’t know why he hasn’t come back so late.
| A．am waiting | B．have waited | C．have been waiting | D．waited |
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---Why you are so worried?
--- I ___for my little son all the afternoon, I don’t know why he hasn’t come back so late.
| A．am waiting | B．have waited | C．have been waiting | D．waited |
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