In recent years, oil______ (substitute) for certain natural materials.

admin2009-05-28 53

问题 In recent years, oil______ (substitute) for certain natural materials.

选项

答案has substituted

解析动词时态。根据时间状语in recent years(通常用于完成时态)，此处需用现在完成时。

转载请注明原文地址:https://kaotiyun.com/show/jSvK777K

大学英语三级A级

相关试题推荐

随机试题

最新回复(0)