单项选择题

He never married, but his life was _____ lonely

A.as
B.by
C.far
D.so
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单项选择题
Many scientists are in the hopes that new ways of generating large amounts of energy will be____ developed
A.succeed
B.success
C.successful
D.successfully
单项选择题
Theories are tested by _______ practice
A.being
B.being
C.applying
D.applying
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