单项选择题

Leaving for work in plenty of time to catch the train will ______ worry about being late.

A．rule off
B．prevent
C．avoid
D．obviate

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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

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

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