Susan still looked very confused.She seemed ____ what the reply meant.A.not grasping.B.not having grasped.C.not to grasp.D.not to have grasped 请说明原因,
问题描述：
Susan still looked very confused.She seemed ____ what the reply meant.
A.not grasping.B.not having grasped.C.not to grasp.D.not to have grasped 请说明原因,
答