单项选择题

The accepted______ of adepuate diet have been challenged by new discoveries in nutrition.

A．formations
B．components
C．standards
D．ingredients
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单项选择题
How strange it is that the habit he developed in his childhood still______ him.
A．takes to
B．clings to
C．attends to
D．adds to
单项选择题
Susan will come to watch him ______at Wimbledon this week.
A．played
B．play
C．to play
D．playing
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