Automatic machines can only do the jobs they ______ to do.

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问题 Automatic machines can only do the jobs they ______ to do.

选项 A、have asked
B、ask
C、have been asked
D、will ask

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。

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