单项选择题

Perhaps I should not have done so, but I changed my mind about the new job even though I was ______ last week.

A．to be started
B．to have started
C．to have been starting
D．start
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单项选择题
An extensive foundation in the basic sciences should be required of all science students, ______.
A．whether they are future physicists or chemists
B．be they future physicists or chemists
C．they are future physicists or chemists
D．they should be future physicists or chemists
单项选择题
The major reason why Americans enjoy an abundant food supply is that the arable land at their disposal for food production is ______.
A．three times more the world average
B．three times as much the world average
C．three times the world average
D．the world average is three times
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