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
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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
单项选择题
I feel very sad that the young man's energetic initiative ______ with nothing in the experiment, for he met a lot of interference from the powerful authority.
A．burned up
B．tuned up
C．pushed up
D．ended up
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