【单选题】【消耗次数：1】
不允许信号通过的频段为滤波器的（ ）。
①
阻带
②
通带
③
过渡带
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Seen;painted
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Seeing;painted
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Being seen;being painted
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Seeing;being painted
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as difficult as ;expensive
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as more difficult as ; more expensive
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as difficult as ; more expensive
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more difficult as ; as expensive
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where
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what
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how
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which
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should have sent
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was going to send
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should be sending
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should send
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aspoliteaspossible
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aspoliteaspossibly
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aspolitelyaspossible
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aspolitelyaspossibly
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to sit;tying
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seating;tied
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might lose
②
would have lost
③
should have lost
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must have lost
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①
leave
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not leave
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come
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①
breaking;running
②
broken;running
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breaking;run
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