单项选择题

_____ for a long time, but he tried his best to catch up with his classmates.

A．Having been ill
B．Being ill
C．Tough he was ill
D．He was ill
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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
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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