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
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单项选择题
—Mark broke his leg when he was playing football.—______was that
A．Since when
B．Since when ago
C．How long
D．How long ago
单项选择题
—I really don't know how to thank you enough.—______.
A．No problem
B．Think nothing of it
C．Not at all
D．It doesn't matter
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