2. 外语
  3. Many people proposed that a national committee be formed to discuss ______ to existing mass transit systems.

Many people proposed that a national committee be formed to discuss ______ to existing mass transit systems.

admin2011-02-26  75
问题 Many people proposed that a national committee be formed to discuss ______ to existing mass transit systems.
选项 A、substitutes
B、measures
C、duplicates
D、alternatives
答案D
解析
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