单项选择题

I didn' t know what to do but then an idea suddenly ______ to me.

A．took place
B．occurred
C．happened
D．went
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单项选择题
The whole path ______ electricity travels is known as a circuit.
A．which
B．along which
C．along with
D．in that
单项选择题
My uncle, as well as his three children, ______ the competition.
A．have joined
B．have joined in
C．has joined in
D．has been joined in
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