第13题: [单项选择]I wouldn't doubt ______ she would want to help us. A. whether B. that C. since D. as 参考答案:B 答案解析:[解析] “doubt+宾语从句”时,在否定句和疑问句中,doubt后面接that引导的宾语从句。例如:I don't doubt that he can finish the task on tim
第35题: [单项选择]牙髓中的主要细胞为 A. 组织细胞 B. 成纤维细胞 C. 成牙本质细胞 D. 以上均是 E. 未分化间充质细胞 参考答案:B
第36题: [单项选择]______ from the top of the hill, the lake is just like a mirror. A. Seeing B. Having seen C. To see D. Seen 参考答案:D 答案解析:从山顶看,这个湖就像一面镜子。句中的逻辑主语是the lake,动词see与the lake之间是动宾关系,即the lake是动词see这一动作的承受者,故选过去分词形式表被动。