填空题

填空题 She has taught in the school since 20 years ago.She has taught in the school（）20 years.

【参考答案】

for
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What can robots do in future homes（）

A．Talk to people.
B．Have fun like people.
C．Keep their own dogs.
单项选择题
45（）。

A．so
B．and
C．for
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