The leaves have turned yellow.
A．谓语 B．表语 C．宾语 D．定语
B
【详解】
句意：这些叶子已经变黄了。
考查句子结构。该句结构为“主+系+表”，The leaves是主语，have turned是系动词，yellow是表语，故选B。
请根据句意从方框中选择合适的动词,并用其适当时态填空,使句子通顺
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