问题补充：
The specialist, some of his assistants, to attend our discussion.
A. and; is
B. or; are
C. as well as; is
D. except for; are
答案：
A. and; is
B. or; are
(答案→)C. as well as; is
D. except for; are
解析：考查主谓一致和词义辨析。And和；如果第一空用and,主语就变成了复数，那么第二空应该使用are;如果第一空用or说明主语还是the specialist，仍然是单数形式。答案为C，第一空用as well as, 句子的主语仍然是the specialist，谓语部分用单数形式。D项的意义与句子不搭配。句意：那位专家和他的助手，要来参加我们的讨论。
