Li Ming is said the experiment in the lab but I can’t find him there. A. to have doneB.

问题补充：

Li Ming is said the experiment in the lab, but I can’t find him there.

A. to have done

B. to do

C. to be doing

D. doing

答案：

A. to have done

B. to do

(答案→)C. to be doing

D. doing

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