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had lost would lose were losing lost
had lost have lost were losing lost
were won were lost were beaten won
looked ahead could look ahead were to look ahead had looked ahead
So as; ahead of; what In order; ahead of; what So as; in advance of; it In order; ahead of; it
had lost would lose were losing lost
were won were lost were beaten won
FIR滤波器容易设计成线性相位特性 FIR滤波器的脉冲响应长度是无限的 FIR滤波器的脉冲响应长度是确定的 对于相同的幅频特性要求，用FIR滤波器实现要比用IIR滤波器实现阶数低
were won were lost were beaten Won
would had to were able to must
were won were lost were beaten Won
were beating beat were beaten had been beaten
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