举个例子来说明吧

　　Ashy,religious-mindedpublisherwhohadmarriedaduke’sdaughter,_____________,thoughChurchillhadsincethe1930sbeenextollingMacmillan’scourage.

　　(A)HaroldMacmillan’srisetothepositionofPrimeMinisterin1957surprisedmany

　　(B)HaroldMacmillan’srisein1957tothepositionofPrimeMinistersurprisedmany

　　(C)HaroldMacmillan’sbecomingPrimeMinisterin1957surprisedmany

　　(D)HaroldMacmillansurprisedmanybyrisingtothepositionofPrimeMinisterin1957

　　(E)thepositionofPrimeMinisterattainedbyHaroldMacmillanin1957surprisedmany

　　这题其实很容易的.第二个逗点前的部份是后面分句的同位词组,分句主语必须和这个同位词组相同.词组说ashy,religious-mindedpublisher,所以后面分句的主语必须是人,而D是唯一符合这个条件的选择.（这个才是真正的语法规矩.）