We had to wait half an hour _______ we had already booked a table.
| A．since | B．although | C．until | D．before |
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31. So serious ________ that even the best doctors failed to save his life.
| A．the man was injured | B．was the man injured |
| C．the man is injured | D．is the man injured |
30. M
r. Keller ______ forty cigarettes a day until he gave it up.
| A．had smoked | B．smokes | C．have smoked | D．smoked |
29. --- Do you know that man?
--- Not really, just a nodding _______.
| A．acquaintance | B．participant | C．relation | D．frequent |
28. Please remember___wins you respect is not your background but your knowledge and virtues.
| A．that | B．what | C．which | D．where |
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