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．Though he was ill
D．He was ill
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单项选择题
The engineer is not happy with the project, and ______ is her boss.
A．neither
B．so
C．either
D．as
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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