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
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单项选择题
At the seventh International Ballet Competition, Fernando Bujones won the first gold medal ever ______to an American male dancer.
A．awarded
B．to be award
C．being awarded
D．should be awarding
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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