单项选择题

More than two hundred years ago the United States ______ from the British Empire and became an independent country.

A. got off
B. pulled down
C. broke away
D. dropped off
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单项选择题
Hydrogen is one of the most important elements in the universe ______ it provides the building blocks from which the other elements are produced.
A. so that
B. but that
C. provided that
D. in that
单项选择题
I'd rather that they ______ during the bad weather, but they insist that they must return home today.
A. don't travel
B. didn't travel
C. shouldn't travel
D. not travel
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