In no circumstances can more work be got out of a machine than______.

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问题 In no circumstances can more work be got out of a machine than______.

选项 A、be put into it
B、is put into it
C、to put into it
D、that is to be put into it

答案B

解析 本句的意思是“在任何情况下,一部机器所得到的功比对它输出的功多”。than is put into it是省略句,省略了主语what。
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