A-A+
Automatic machines can only do the jobs they _
问题详情
Automatic machines can only do the jobs they ______ to do.
A．have asked
B．ask
C．have been asked
D．will ask请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：C
解析：本题考查被动语态的用法。主语“automatic machines”与“ask”是一种被动关系，故要用被动语态。
