B,studied
虽然后面有for a term,但毕竟前面还有once,
had studied 是过去完成,表示过去的过去,这里用不合适.如果主句的is 是was就可以了.
has studied是现在完成时,现在完成时的特点是对现在有影响,所以,如果选这个,那么主语tom 现在还应该在westbrook high school .
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高考英语 麻烦解释下 谢谢!Tom is now in our class,but he once __in westb
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