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
Without the friction between their feet and the ground, people would______ be able to walk.
A．in no way
B．on any account
C．by all means
D．in no time
单项选择题
His wealth enabled him to______ his passionate interest in art.
A．devote
B．engage
C．pursue
D．register
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