单项选择题

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
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单项选择题
A new technique ______, the yields as a whole increased by 20 percent.
A. working out


B. having worked
C. having been worked out

D. to have been worked out
单项选择题
______ receiving financial support from family, community or the government is allowed, it is never admired.
A. As
B. Once

C. Although
D. Lest
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