单项选择题

______I hadn't been so careless!

A. If
B. Useless
C. Only if
D. If only
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单项选择题
_________ still young, Mr. George has had amazing achievement in cosmology.
A. When
B. As
C. Although
D. Since
单项选择题
I would rather you ______them to those who appreciate them as presents.
A. give
B. gave
C. will give
D. have given
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