Investigators are still unsure why the plane would've changed course
讲马来航班失踪的
1. 这里would've changed course是什么时态，表达什么含义呢？
2. 和why the plane changed course
3.我用完成时的话，应该怎么用，意义有什么区别么？
why the plane has changed course
还是why the plane had changed course?
讲马来航班失踪的
1. 这里would've changed course是什么时态，表达什么含义呢？
2. 和why the plane changed course
3.我用完成时的话，应该怎么用，意义有什么区别么？
why the plane has changed course
还是why the plane had changed course?
