----Why isn’t Cathy here yet?
--- She _________ to be picked up at the station．
| A．could wait | B．must wait |
| C．might be waiting | D．can be waiting |
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----Why isn’t Cathy here yet?
--- She _________ to be picked up at the station．
| A．could wait | B．must wait |
| C．might be waiting | D．can be waiting |
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