单项选择题

There is no doubt ______ Herbert is the most industrious student in our class.

A．whether
B．what
C．that
D．if
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单项选择题
The projects ______ by the end of 2002 will expand the city' s telephone network to cover 1,000, 000 users.
A．being accomplished
B．to be accomplished
C．accomplished
D．having been accomplished
单项选择题
The ratio of the work done by the machine ______ the work done on it is called the efficiency of the machine.
A．against
B．with
C．to
D．for
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