D,通常成双成对形式出现的名词,如：glasses眼镜、trousers裤子等做主语时,谓语用复数,但是如果前面出现单位名词时,要根据单位名词来判断
如：One pair of scissors（剪刀） is not enough.
Two pairs of scissors are enough.
a pair of sunglasses 后面用单数还是复数?
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