Henry will not be able to attend the meeting tonight because ___

Henry will not be able to attend the meeting tonight because ______.
A、he must to teach a class
B、he will be teaching a class
C、he will teach a class
D、he will have teaching a class
【正确答案】：B
【题目解析】：这道题考查将来进行时的用法。当要表示将来要进行的某一个动作时，可以使用将来进行时，其构成是“will+be+doin9”此处强调当时(tonight)正在做某事，故选B项。