单项选择题

I would have gone to the lecture with you ______ I was so busy.

A．except that
B．provided that
C．but that D, only that
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单项选择题
______, it is widely used in making flares and fireworks.
A．As the brilliant white light that burning magnesium produces
B．Because of the brilliant white light of burning magnesium
C．The brilliant white light of burning magnesium
D．Burning magnesium produces a brilliant white light
单项选择题
Whenever work is being done, energy ______ from one form into another.
A．converts
B．converted
C．is converted
D．is being converted
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