一道sat语法题Although he played a leading role in planning spacec

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一道sat语法题
Although he played a leading role in planning spacecraft expeditions,Dr.Carl Sagan refused to accept praise for the plans he (designed nor otherwise profiting) from later advancements in space exploration.括号里的应改为had designed or otherwise to profit 为什么?请说详细一点

这题考的是平行结构
Dr.Carl Sagan refused to accept praise for the plans he (designed nor otherwise profiting) from later advancements in space exploration.
说的是Carl Sagan refused to do sth or to do another thing.
to accept praise for the plans he designed 这是第一个sth
to profit from later advancements in space exploration这是other thing
所以要用 or to profit 来使句子平行至于那个had并不是此题的考点不加had一样可以表达过去的过去的意思 (design 发生在 refuse之前) 但是加了表达的更明确.貌似除了after之类的后面必须加had之外其他的都不是强制的...

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