6. Jane can’t attend the meeting at 3 o’clock this afternoon because she ______ a class at that time.
A
will teach
B
would teach
C
has taught
D
will be teaching
句子中强调将来某一时刻at that time(this afternoon),所以应该选择表示将来某时正在进行某事的时态，即将来进行时，故选项D符合答案。
根据句意理解Jane下午三点钟不能参加会议是因为她那时候将正在上课
常见将来进行时理解不准致错。