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
网友回答
(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。