单项选择题

The professor is quite difficult pleased .（）

A．to please
B．to be pleased
C．for pleasing
D．pleasing

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单项选择题
Unlike competitive running , race walkers must always keep some portion of their feet in contact with the ground.（）

A．run
B．runner
C．runners
D．running race
单项选择题
It was not until she arrived at the classroom she realized she had forgotten her coursebook.（）

A．and she realized
B．which she realized
C．then she realized
D．that she realized
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