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.

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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 alternatives代替物或方式，常与to搭配；substitutes代替，替代，常与for搭配；measures措施，常与to搭配；duplicates复制品，常与of搭配。
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