—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

—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

1. A.
   wonder
2. B.
   wondered
3. C.
   wondering
4. D.
   having wondered

 —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

—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

—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

—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.

 —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