—Some researchers___ desks that can be folded(折叠) so far. —Really？In this way, people can take them wherever they go.

当前位置：初中英语 / 单选题

1. (2023九下·上海月考) —Some researchers___ desks that can be folded(折叠) so far.
—Really？In this way, people can take them wherever they go.

A . developed B . were developing C . have developed

微信扫码预览、分享更方便