The machine is easy to if you follow the instructions.
A. be operated
B. operate
C. be operated on
D. operate on
网友回答
A. be operated
(答案→)B. operate
C. be operated on
D. operate on
解析：考查不定式用法。当前面的形容词是easy/hard/difficult等对句子主语的性格特征进行说明的时候，后面的不定式使用主动形式表示被动含义。句意：任何你按照说明书，这台机器很容易操作。故B正确。