20.A As Russell Banks suggests, it is a lack of grand ideas that have only left writers with semiotics, hermeneutics, and deconstruction.

(A) As Russell Banks suggests, it is a lack of grand ideas that have only left writers with

(B) Writers, Russell Banks suggests, who lack of grand ideas and leave only

(C) Russell Banks suggests that a lack of grand ideas has left writers with only

(D) It is Russell Banks’ suggestion that a lack of grand ideas have left writers only with（C）

(E) It is only a lack of grand ideas, Russell Banks suggests, which leave writers with

为何改成C，A是强调句，改动不好吧?