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。