— Where is my English book?

— I brought it to you _____you were in hospital yesterday afternoon.

A．since

B．if

C．once

D．while

下列哪些是儿童孤独症的典型症状（）

A.社会交往障碍

B.智能障碍

C.感知觉障碍

D.多动症状

E.语言障碍