—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 |
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—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 |
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