There must be somebody in Tom`s home.I`m sure that either Tom or his parents at home now.

问题补充：

There must be somebody in Tom`s home.I`m sure that either Tom or his parents at home now.

A. are

B. is

C. were

D. was

答案：

(答案→)A. are

B. is

C. were

D. was

解析：考查主谓一致。固定词组either…or…要么…要么…放在句首做主语，谓语动词使用就近一致。本题 his parents靠近，故使用复数形式。根据.I`m sure说明本句使用一般现在时，故A正确。