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:A
题目分析: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。
点评: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。