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
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
Vingo was released from prison_____the successful efforts of his friends to prove his innocence.
A．according to
B．as a result of
C．for reasons of
D．with the help of
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