.A ________may be given ____means of flags, lights, and guns.A．sign; byB．signal;
题型：不详难度：来源：
.A ________may be given ____means of flags, lights, and guns.| A．sign; by | B．signal; in | C．signal; by | D．sign; in |
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答案
| C |
解析
| 考查词义辨析。sign 符号，signal 信号，短语：by means of 以什么样的方式，句意：信号可以以红旗，灯光和发枪的形式给出。所以选C。 |
举一反三
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