单项选择题

It is well known that the first ______ can only work hard planting young trees for a new business, while the following people may obtain the successful fruits.

A．practitioners
B．amateurs
C．forerunners
D．managers
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单项选择题
Although there are several variations on the exact format that worksheets can take, they are all similar in their ______ aspects.
A．potential
B．social
C．essential
D．partial
单项选择题
We were politely ______ an armed guard and warned not to take pictures.
A．assigned
B．allowed
C．accepted
D．assisted
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