I won’t be able to attend the meeting tonight because _________ .A.I must teach a classB.I

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I won’t be able to attend the meeting tonight because _________ .

A.I must teach a class

B.I teach a class

C.I will be teaching a class

D.I will have been teaching a class

请帮忙给出正确答案和分析,谢谢!

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