Question

.If _____,the experiment will be successful.

A．carefully doing

B．it done carefully

C．carefully done

D．doing carefully

Answer 1

C

考查状语从句的省略。主语the experiment与do之间是被动关系，所以用过去分词done，句意：如果这个实验被认真做的话，它会成功的。carefully done前省略了it is，所以选C。