单项选择题


A．It
B．There
C．She
D．Here
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单项选择题
A．forgotB．cameC．fearedD．remembered
A．forgot
B．came
C．feared
D．remembered
单项选择题
The existence of electricity in the air has been known ______.
A．for hundreds .of years
B．for several years
C．recently
D．for thousands of years
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