用is
is是be动词,而所有的动词的变化形式都是由动作的施动者（一般是句子的主语）决定的.
此句主语是pen,单数,所以用is.
跟后面的black and white 是没有关系的.
是My pen is black and white 还是用are?why?
3个回答
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