标题: OG12 14题 [打印本页] 作者: canny9457 时间: 2011-6-16 03:35 标题: OG12 14题 14. Sunspots, vortices of gas associated with strong electromagnetic activity, are visible as dark spots on the surface of the Sun but have never been sighted on the Sun’s poles or equator. (A) are visible as dark spots on the surface of the Sun but have never been sighted on (B) are visible as dark spots that never have been sighted on the surface of the Sun (C) appear on the surface of the Sun as dark spots although never sighted at (D) appear as dark spots on the surface of the Sun, although never having been sighted at (E) appear as dark spots on the Sun’s surface, which have never been sighted on
A选项中，are visible是一般现在时，have never been sighted 是现在完成时，如何平行？作者: camelo777 时间: 2011-6-16 09:59
你要主要要从逻辑的角度去理解，这前面是一个现象，所以用一般现在时，用别的时态都不对。后面表示到现在为止都没发现，所以用现在完成时，所以没有问题。不要老想着去找简单的平行，要从逻辑意思的角度去思考每道题目~
open to discussion作者: lonelyorchid 时间: 2011-6-16 14:38
从来没有人说过平行结构中时态要平行,甚至动词分词都不一定平行(现在和过去),如果你不幸的从哪里听到过,那么请你从现在开始努力忘掉他