In my opinion he is to attend the important meeting tomorrow.A. possibleB. probableC. li

问题补充：

In my opinion, he is to attend the important meeting tomorrow.

A. possible

B. probable

C. likely

D. perhaps

答案：

A. possible

B. probable

(答案→)C. likely

D. perhaps

解析：本题的含义是以我的观点，他明天有可能参加这个重要的会议。be likely to表示个人观点认为的一种可能性，故本题选C。