单项选择题

The effect of doubling the width of a beam,______ is to double the load that can be sustained.

A．other factors remain constant
B．other factors remained constant
C．the other factor being constant
D．other factors remaining constant
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单项选择题
Members of the party all appreciate Jackson's wanting to help them______ their difficulties.
A．come over
B．tide over
C．take over
D．smooth over
单项选择题
In order to convince the director to agree on their plan, they______ a number of reports which supported their argument.
A．brought out
B．brought forth
C．call forth
D．put forward
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