no sound and no voice__heard for a long time.A is B are

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no sound and no voice__heard for a long time.A is B are

no sound and no voice__heard for a long time.A is B are
no sound and no voice__heard for a long time.A is B are

no sound and no voice__heard for a long time.A is B are
A is

are
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A is

is
sound 和voice都是不可数名词,谓语动词用单数