the great scientist( )his close correspondence with his former tutor.a:has been still kept upb:has still kept up c:is still kept up d:still keeps up

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the great scientist( )his close correspondence with his former tutor.a:has been still kept upb:has still kept up c:is still kept up d:still keeps up

the great scientist( )his close correspondence with his former tutor.a:has been still kept upb:has still kept up c:is still kept up d:still keeps up
the great scientist( )his close correspondence with his former tutor.a:has been still kept up
b:has still kept up c:is still kept up d:still keeps up

the great scientist( )his close correspondence with his former tutor.a:has been still kept upb:has still kept up c:is still kept up d:still keeps up
d:still keeps up his close correspondence (通信)
仍然保持着密切联系.
这里没有现完的提示词,所以我认为只能选D了.
而且密切联系的话就是经常性的,用一般现在时也是很恰当的
现在完成时的确表示持续动作,但是这里没有给你一个时间比如for two weeks(也就是现完提示词),你就不能随意选择现完.

选a
表示科学家
一直很努力

选b,现在完成时态表示持续动作

而发热而且

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