单项选择题

The old farmer was run down by a car. He was taken to the hospital and ______ on by the chief surgeon right now.

[A] operated
[B] having been operated
[C] is operated
[D] is being operated
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单项选择题
You know so much about literature. It's a pity you failed your degree, Harry said, You ______ a good teacher.
[A] would have been
[B] can have been
[C] must be
[D] should have been
单项选择题
Although the colonists ______ to some extent with the native Americans, the Indians' influence on American culture and language was not extensive.
[A] migrated
[B] matched
[C] mingled
[D] melted
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