单项选择题

Although he was ill, ______ he went on working.

A．but
B．yet
C．and
D．while
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单项选择题
______ he referred to in his speech, the pollution in Beijing is indeed not serious.
A．What
B．As
C．Which
D．Since
单项选择题
When she heard the news, her hope ______ disappointment.
A．got
B．turned in
C．turned to
D．felt
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