18.A lot of employees at the company said Eric was difficult_____.
答案解析
解析：
在“主语+系动词+形容词+to do”结构中,如果句子的主语与动词不定式中的动词有逻辑上的动宾关系,且形容词表示主语的特征或性质,此时常用不定式的主动形式表示被动含义。常用在该结构中的形容词有Casy , hard, difficult, important, interesting,impossible , nice,chesp 等。根据向意可知,Eric 和 communicate with 之间是逻辑上的动宾关系,所以应用不定式的一般式。故选 C。
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