单项选择题

_________ still young, Mr. George has had amazing achievement in cosmology.

A. When
B. As
C. Although
D. Since
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I would rather you ______them to those who appreciate them as presents.
A. give
B. gave
C. will give
D. have given
单项选择题
______they invite you to speak, remain silent. A. Even though B. Though C. If D. Unless
______they invite you to speak, remain silent.
A. Even though B. Though C. If D. Unless
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