- 搜标题
- 搜题干
- 搜选项
单项选择题
He ______ at the meeting, but his heart attack prevented him.
He ______ at the meeting, but his heart attack prevented him.
A.
will speak
B.
is going to speak
C.
had to speak
D.
was going to speak
，则当
按逆时针方向沿
绕行一周时，
幅角的改变量为 .
