You ______ when you heard the news.

问题描述:

You ______ when you heard the news.
A、 must have been very excited B、 must be very excited C、 can be very excited D、will have been very excited

A
必须分辨清楚.其实前三个字最关键,就是must have been,必须在此用.我也解释不清楚,不过这没错呀!