Reading is an experience quite different from watching TV; there are pictures in your mind ________ instead of before your eyes．
A.to form
B.form
C.forming
D.having formed
网友回答
C解析此句意为“读书不同于看电视，头脑中而非眼前要形成图景”．这是there be结构后接非谓语动词，因为图景(pictures)是主动形成，而非被动，所以选择C项．D项having formed是完成式的现在分词，表示动作先于谓语动词there are，显然错误，因为读书的同时头脑中形成图景画面，而非之前．