World leaders have to face the fact that ________ global warming has become perhaps ________ most complicated issue.
| A．/；the | B．/；/ |
| C．the；the | D．the；/ |
相关试题
_______you can easily have lunch in the restaurant around the corner, why do you take the trouble to drive many miles here?
| A．When | B．Unless | C．While | D．Where |
Watching the 2010 World cup is my dream, ______ that I’m expecting for years.
| A．one | B．it | C．/ | D．those |
______ our return, all the students burst into cheers for our excellent performances.
| A．At | B．In | C．On | D．With |
Next door to ours ________, who is no less than eighty.
| A．that lives an old man | B．does an old man live |
| C．lives an old man | D．where lives an old man |
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