单项选择题

How many more decades will have to pass 　_____　scientists succeed in providing a cure for cancer？

A．when
B．before
C．since
D．until
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单项选择题
The man has a special talent for art and is _____ of a musician.
A．anybody
B．anything
C．somebody
D．something
单项选择题
The engineer is not happy with the project, and _____ is her boss.
A．neither
B．so
C．Wither
D．as
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