2. 外语
  3. Traffic signs are used______the flow of traffic.

Traffic signs are used______the flow of traffic.

admin2019-07-01  51
问题 Traffic signs are used______the flow of traffic.
选项 A、the control
B、control
C、to control
D、for control
答案C
解析 The verb are used is followed by an infinitive: to control.
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托福（TOEFL）

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