—Where is he exactly?
—I don’t know, but I saw him _______ an experiment in the lab when I passed by.
| A．to conduct | B．conducted |
| C．conducting | D．conduct |
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—Where is he exactly?
—I don’t know, but I saw him _______ an experiment in the lab when I passed by.
| A．to conduct | B．conducted |
| C．conducting | D．conduct |
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