单项选择题

If you have never planted anything, you won't be able to know the pleasure of watching the thing you have planted ______.

A. grow
B. to grow
C. growing
D. to be growing
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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
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
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