单项选择题

Hardly ______ he entered the classroom when the rain began to fall in big drops.

A．he has
B．has he
C．he had
D．had he
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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
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
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