单项选择题

66（）

A．However
B．Therefore
C．Furthermore
D．Nevertheless

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单项选择题
______ the fact that his initial experiments had failed, Prof. White persisted in his research.
A．In spite of
B．Because of
C．As to
D．In view of
单项选择题
We are fortunate ______ several descriptive papers have been published which give adequate background and experimental results.
A．in which
B．so that
C．as if
D．in that
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