【题目】Many students are _____ chatting online, which wastes them plenty of time.
A. connected with
B. worried about
C. crazy about
D. anxious about
在线课程【答案】C
【解析】剖析. be crazy about 意为“对……着迷，醉心于……”，符合语境。be connected with 意为“与……有关”;be worried about 和 be anxious about均表示“为……而担忧”。