题目

The number of medical schools reached 18 in the early 1990s and_________ around that level ever since.（ ）A. are remainingB. have remainedC. is remainingD. has remained

The number of medical schools reached 18 in the early 1990s and_________ around that level ever since.（ ）

A. are remaining

B. have remained

C. is remaining

D. has remained

题目解答

答案

D. has remained

解析

步骤 1：确定句子的时态
句子中提到的时间状语 "ever since" 表示从过去某个时间点开始一直持续到现在，因此需要使用现在完成时。
步骤 2：确定主语和谓语的一致性
主语 "the number of medical schools" 是单数形式，因此谓语动词需要使用单数形式。
步骤 3：选择正确的选项
根据以上分析，选项 D "has remained" 符合现在完成时和主谓一致的要求。