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。