单选题
In no circumstances can more work be got out of a machine than ______.
A、
be put into it
B、
is put into it
C、
to put into it
D、
that is to be put into it
【正确答案】
B
【答案解析】
[解析] 本句的意思是“在任何情况下，一台机器所能做的功都不可能比对它做的功多”。than is put into是省略句，省略了主语what。
提交答案
关闭