单选题：根据材料，回答题：On Halloween, children in the United States often d

题目内容：

根据材料，回答题：

On Halloween, children in the United States often dress up as__________.
A．ghosts.
B．players.
C．pilgrims.　　
D．visitors.

参考答案：

答案解析：

Prizes and money are usually provided by TV stars and large

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请在第（56）处填上最佳答案。A．can B．must C．may D．cannot

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The writer claims that it is important for specialists to be able to travel beca

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