—Do you know what to do in the lab Mike? —Oh sorry I don’t----just if I could get a tic

问题补充：

—Do you know what to do in the lab, Mike?

—Oh, sorry I don’t----just if I could get a ticket for the Shanghai Expo.

A. wonder

B. wondered

C. wondering

D. having wondered

答案：

A. wonder

B. wondered

(答案→)C. wondering

D. having wondered

解析：根据“我”回答sorry I don’t，可知“我”刚才正在想是否能买到上海世博会的票，所以用过去进行时态，故答案C。