填空题


【参考答案】

a→an
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单项选择题
A．He is in the office.B．He is out.C．He is at the theatr
A．He is in the office.
B．He is out.
C．He is at the theatr
单项选择题
The word carbon (Line 5, Par
A．2) Stands for ______.A. intelligent robotsB. a chemical elementC. an organic substanceD. human beings
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