单项选择题

Because of the great speed of light, we see a lamp light up almost at the exact moment______.

A．we turn it on
B．when we turn on it
C．that we turn on it
D．which we turn it on
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单项选择题
We had n’’ t met for 20 years, but I recognized her ______ I saw her.
A．the moment
B．for the moment
C．the moment when
D．at the moment when
单项选择题
We find it impossible to ______ with the latest safety regulations.
A．accord
B．unify
C．obey
D．comply
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