If carefully the experiment will be successful.A. doB. doesC. doneD. doing

问题补充：

If carefully, the experiment will be successful.

A. do

B. does

C. done

D. doing

答案：

A. do

B. does

(答案→)C. done

D. doing

解析：答案选C，可视为if it is carefully done之省略。

【标签】省略