单项选择题


A．forgot
B．came
C．feared
D．remembered
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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
单项选择题
A．exactB．someC．largeD．enough
A．exact
B．some
C．large
D．enough
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