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.A ________may be given ____means of flags, lights, and guns.
A.sign; byB.signal; inC.signal; byD.sign; in
C
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。
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