问题
选择题
I didn’t see her in the meeting room this morning. She ___ at the meeting.
A．mustn’t have spoken
B．shouldn’t have spoken
C．needn’t have spoken
D．couldn’t have spoken
答案
答案：D
搜题请搜索小程序“爱下问搜题”
I didn’t see her in the meeting room this morning. She ___ at the meeting.
A．mustn’t have spoken
B．shouldn’t have spoken
C．needn’t have spoken
D．couldn’t have spoken
答案：D
阳的距离为a，近日点离太阳的距离为b，过远日点时行星的速率为vA，则过近日点时的速率为
va
va
va
va