单项选择题

______ 1895 did Cornell University begin to offer a degree in ornithology (鸟类学).

A．Not until
B．Not since
C．Until
D．In
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单项选择题
Having been served lunch, ______.
A．the problem was discussed by the committee
B．the committee discussed the problem
C．it was discussed by the committee the problem
D．a discussion of the problem was discussed
单项选择题
Early forms of life on Earth, ______ in absence of oxygen, required other elements.
A．which lived
B．that lived
C．lived
D．were living
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