填空题

填空题 She has twenty American students in her class.There（）twenty American students in her class.

【参考答案】

are
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She has taught in the school since 20 years ago.She has taught in the school（）20 years.
单项选择题
What can robots do in future homes（）

A．Talk to people.
B．Have fun like people.
C．Keep their own dogs.
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