The examination____________(一定很难)since none of the students passed. must have be

游客2023-07-22 41

问题 The examination____________(一定很难)since none of the students passed.

选项

答案 must have been very difficult

解析对过去的肯定推测使用“must+完成时”形式。

转载请注明原文地址:http://tihaiku.com/zcyy/2859390.html

相关试题推荐

随机试题

最新回复(0)