单项选择题

By the time you graduate, we ______ in Australia for one year.

A. will be staying
B. will have stayed
C. would have stayed
D. have stayed
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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 ______ him the Christmas gift by mail because he came home during the Christmas holidays.
A. ought to have sent
B. couldn't have sent
C. must have sent
D. needn't have sent
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