Mr. Lee is to show up at the meeting.A. possibleB. likely C. probableD. Perhaps

问题补充：

Mr. Lee is to show up at the meeting.

A. possible

B. likely

C. probable

D. Perhaps

答案：

A. possible

(答案→)B. likely

C. probable

D. Perhaps

解析：句意：李先生很有可能来到会场。Sb be likely to do某人有可能做某事；其他的三个词没有这种句型，故选B。