2. 外语
  3. I must have hung ______ for ten minutes before the telephone operator put me through.

I must have hung ______ for ten minutes before the telephone operator put me through.

admin2011-03-26  46
问题 I must have hung ______ for ten minutes before the telephone operator put me through.
选项 A、up
B、round
C、on
D、over
答案C
解析 (hang on不挂断)。句意为：接线员给我接通之前，我必须十分钟不挂断电话。A．hang up挂断电话；B．hang round闲荡；D．hang over遗留下来。
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