—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 |
相关试题
Because of my poor English I’m afraid I can’t make myself ____．
| A．understand | B．to understand | C．understanding | D．understood |
I really appreciate that your help is of great _________.
| A．useful | B．value | C．important | D．worth |
He insisted that we ________ rest until we finish the work.
| A．not | B．don’t | C．can’t | D．should |
He was _______ to find that it was almost impos
sible to undertake the task.
| A．cast off | B．cast out | C．cast away | D．cast down |
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