单项选择题

What did Benjamin Franklin invent in 1752

A． The first fishing rod.
B． The first lightning rod.
C． The first rod.
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单项选择题
Julia promised ______.
[A] to attend the lecture with him next time
B. not to be late for the lecture
C. to tell him about the first part
单项选择题
A．onB．inC．atD．to
A．on
B．in
C．at
D．to
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