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
I know Jonathan quite well and never doubt ______ he can do a good job of it.
A．whether
B．that
C．when
D．what
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
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