How old___your parents at that time?A.is B.was C.are D.were 希望有解释,

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答案选D.were
首先,主语为your parents,为复数名词,谓语动词需用复数形式；其次,at that time为过去的时间,因此谓语动词的时态需用过去时态.结合这两者,所以答案选D.were.

选D吧。 at that time 意为在那时，那应该是用过去时态， parents 是指两个人，所以用were。

D.were
因为有at that time,所以认定是过去时，排除A,C
又因为parents是复数，故排除B，选D.

D at that time 是过去式。 parents 复数

当然是D了

你父母那时几岁？选D 因为有过去式和复数

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